LED (light-emitting diode) is a kind of solid-state semiconductor device that can convert electric energy into visible light, which can directly convert electricity into light.LEDs can directly emit red, yellow, blue, green, green, orange, purple, white light.LED lighting source has the advantages of low-voltage power supply, low energy consumption, strong applicability, high stability, short response time, no pollution to the environment, multi-color luminescence, and so on advantages. However, it also has disadvantages.
Although the price is higher than the existing lighting equipment, it is still considered that it will inevitably replace the existing lighting devices. The global lighting market has been undergoing a radical transformation driven by the massively growing adoption of light-emitting diode (LED) technology. This solid-state lighting (SSL) revolution fundamentally altered the underlying economics of the market and dynamics of the industry.
If you want to learn more advantages and disadvantages of LED Lighting, please continue reading this article.
Advantages of LED Lighting
1. Energy conservation
One of the main advantages of LED lamps is that they produce higher lumens per watt than incandescent lamps and fluorescent tubes or bulbs. This means that they can produce the same amount of light at a lower energy input. LED is made of semiconductor materials to produce light-emitting diode, which directly converts electrical energy into light energy. The basic working principle of the energy-saving lamp is the same as that of the fluorescent lamp. The ballast is changed into an electronic one and integrated with the lamp tube. Although it saves electricity than an incandescent lamp, its conversion efficiency is lower than that of LED. The energy consumption of white LED is only 1 / 10 of incandescent lamps and 1 / 4 of the energy-saving lamps. Generally, the luminous efficiency of Halogen Bulb is 15-20lumens / watt; the luminous efficiency of Incandescent Light Bulb is 12-24 lumens/watt; the luminous efficiency of CFL bulbs is about 65 lumens/watt; now the luminous efficiency of LED Light Bulb is 100-130 lumens/watt. For example, to produce 500 lumens, a typical incandescent lamp needs 50 watts, while a fluorescent or energy-saving lamp requires 20 watts. However, an LED bulb takes only 5 watts to produce 650 lumens. This advantage translates into cost savings in electricity charges.
2. Long Lifetime
One of the biggest advantages of LED lights is a long service life.LED lamp has a longer service life, up to 50000-100000 hours. The life of an LED lamp is determined by light attenuation. Generally speaking, the longer the time is used, the greater the light attenuation, the dimmer the brightness of the lamp will be, until it finally does not light up and can not work normally. There are two reasons for the light failure, one is the light failure of the blue LED itself, the other is the light failure of phosphor. Different LED lamps have different light attenuation. Generally speaking, the earlier the temperature of the semiconductor junction, the shorter the lifetime of the PN junction. The light-emitting mechanism of the light-emitting diode is determined by the special structure of the diode. The diode is mainly composed of a PN crystal chip, electrode, and optical system. When the forward bias voltage is applied to the electrode, the electrons and holes are injected into the p region and the hole respectively In the N region, when the nonequilibrium minority carriers and the majority carriers recombine, the excess energy will be converted into light energy in the form of radiation photons. The luminescence process consists of three parts: carrier injection under forwarding bias, recombination radiation, and light energy transmission. It can be seen that the diodes emit light mainly by the carrier moving from time to time, and there is no phenomenon of aging and burning off. Its special light-emitting mechanism determines that the light-emitting lifetime is as long as 50000-100000 hours.
3. Sturdy and durable
The LED chip is completely encapsulated in epoxy resin. The compact epoxy resin particles are extremely difficult to break, and there is no loose part of the whole lamp body; the chip inside is extremely difficult to break, and there is a little thermal effect that may volatilize and fuse. These features make it difficult to damage LEDs. LED is a solid-state package, belonging to the cold light source type. Solid-state equipment is usually mounted on a metal core printed circuit board (MCPCB) and the connections are usually provided by soldered conductors. LEDs emit light from semiconductor blocks, not from glass bulbs or tubes. There is no fragile glass, no moving parts, no broken filament, so the LED lighting system is very resistant to shock, vibration, and wear.
The luminescent principle of the cold light source is that under the action of the electric field, electron collision is produced to excite fluorescence material to produce the luminescence phenomenon. It has excellent optical and flicker characteristics. The cold light source does not heat when it works, which avoids a series of problems related to heat accumulation. The characteristic of the cold light source is that almost all other energy is converted into visible light, and there are few other wavelengths of light. However, the thermal light source is different. In addition to visible light, there is a large amount of infrared light, and a considerable part of the energy is converted into infrared light which does not contribute to lighting. The light from the hot light source plus the infrared filter should be similar to that from the cold light source because the infrared light has been filtered out. Therefore, it is very easy to transport and install and can be installed in any micro and enclosed equipment without fear of vibration.
4. Environment protection
Compared with the traditional light source, LED has better environmental protection benefits. There is no ultraviolet and infrared in the spectrum. The waste can be recycled, pollution-free, and mercury-free. It can be safely touched. It is a typical green lighting source. LED lamps do not use high-risk mercury like fluorescent lamps, and there will be no public hazards such as mercury ions and phosphors that may leak during the manufacturing process or after the bulb is damaged. The epoxy resin used for manufacturing LED belongs to an organic polymer compound. After curing, it has good physical and chemical properties. It has high bonding strength to wafer and metal, hard and flexible, stable to saline-alkali and most solvents, and is not easy to be damaged. Even if it is damaged or aged, it can be recycled and reused without causing pollution to the environment. For the particle layout of ED lamps and displays, the light produced is generally scattered, and little light pollution is produced. Led working voltage is low, DC drive mode is adopted, ultra-low power consumption (single tube 0.03 ~ 0.06w), photoelectric power conversion is close to 100%, under the same lighting effect, more than 80% energy saving than the traditional light source.
5. Modern techniques
Compared with the traditional light source, the LED light source is a low-voltage microelectronic product, which successfully integrates computer technology, network communication technology, image processing technology, and embedded control technology. The chip size used in the traditional LED lamp is 0.25mmx0.25nm, while the size of the LED for lighting is generally more than 1.0mmx1.0mm. The working table structure, inverted pyramid structure, and flip-chip design of bare LED can improve its luminous efficiency and emit more light. The innovation of LED packaging design includes high conductivity metal block substrate, flip-chip design, and bare disk casting lead frame. Using these methods, high power and low thermal resistance devices can be designed, and the illumination of these devices is higher than that of traditional LED products.
6. Widely used
Many lamps and lanterns, such as desk lamp, floor lamp, living room chandelier, crystal lamp, wall lamp, etc., use LED bulb as light source; the cost of these lamps is high, the main cost is on the lamp body, and the cost of the light source is low; when the light source is broken, the light source can be replaced at low cost without the maintenance of the whole lamp Maintenance cost of use.
In addition, application directions include:
1. Building exterior lighting: to project a certain area of a building, it is no more than the use of a round head and square head shape projection lamps to control the beam angle. The LED light source is small and thin. The research and development of linear projection lamps undoubtedly become a highlight of LED projection lamps, because many buildings do not have a place to place traditional projection lamps. It is easy to install, can be installed in the horizontal or vertical direction, better combined with the surface of the building, bringing lighting designers a new vocabulary of lighting, expanding the creative space. And will have an impact on the lighting methods of modern buildings and historical buildings.
2. Landscape lighting: unlike traditional lamps and lanterns, LED light source is mostly glass bubble shell. It can be organically combined with urban street furniture and can be used for lighting in urban leisure space such as path, stairs, deck, waterfront, and gardening. For flowers or low shrubs, LED can also be used as a light source for lighting.
3. Signs and indicative lighting: for example, road surface separation display, stair-step local lighting, emergency exit indication lighting, led self-luminous underground lamp with appropriate surface brightness or lamps embedded in a vertical wall, ground guide light in theater auditorium or indicator light on the side of the seat, and guide light on the floor of the shopping center, etc.
4. Indoor space display lighting: LED light source can be used as a substitute for optical fiber lighting in museums. Commercial lighting mostly uses color LED, indoor decorative white LED combined with interior decoration provides auxiliary lighting, the hidden light band can use LED, especially for low space.
5. Entertainment places and stage lighting: due to the dynamic and digital control of LED color, brightness, and dimming, the lively saturated color can create static and dynamic lighting effects. From white light to any color in the full spectrum, the use of LED opens a new way of thinking in this kind of space lighting.
6. Video screen: full color LED display screen is the most eye-catching outdoor large-scale display device in the world. It adopts advanced digital video processing technology and has an incomparable large area and ultra-high brightness.
7. Vehicle indicator lighting: used for LED navigation information display of vehicle road traffic. In urban traffic, highway and other fields led as a variable indicator and lighting function.
In addition, the LED lights installed on the screen can also adopt various specifications of luminous pixels according to different indoor and outdoor environments to achieve different brightness, color, and resolution to meet various purposes.
7. Multi transform
The LED combination of light and color change multi-terminal, can achieve rich and colorful dynamic change effect and various images. LED light source can make use of the principle of red, green, and blue three primary colors, under the control of computer technology, make the three colors have 256 levels of gray level and mix them arbitrarily, which can produce 256 × 256 × 256 = 16777216 colors, form a combination of different light colors, and realize rich and colorful dynamic change effects and various images.
8. Multi color temperature
The color temperature of warm color light is below 3300K. The color of warm color light is similar to that of incandescent lamps, and the red light component is more, which gives people a warm, healthy, and comfortable feeling. It is suitable for places such as families, residences, dormitories, hospitals, hotels, etc., or places with relatively low temperatures. Warm white light is also called intermediate color, and its color temperature is between 3300K and 5300K. Warm white light and soft light make people feel happy, comfortable, and peaceful. It is suitable for shops, hospitals, offices, restaurants, waiting rooms and other places. Cold color light is also called sunlight color. Its color temperature is above 5300K. Its light source is close to natural light. It has a bright feeling and makes people concentrate. It is suitable for office, meeting room, classroom, drawing room, design room, library reading room, exhibition window, and other places.
There is no ultraviolet and infrared ray in the light, no filament and glass shell, no broken traditional lamp tube, no harm to the human body, and no radiation. LED lamps use a low-voltage DC power supply (which can convert AC to DC). The power supply voltage is between 6 ~ 24 V, which varies with different products. It is a safer DC power supply than a high-voltage power supply, especially suitable for families and public places.
10. More colorful
In the past, the color of lamps and lanterns on the market is very single. In order to achieve the purpose of color, one is to brush paint on the surface of lamps and lanterns or cover colored films; the other is to fill lamps with inert gas to emit light, so the richness of colors is limited. LED is a digital control, the light-emitting chip can emit a variety of colors, LED light source can use the principle of red, green, blue three primary colors, under the control of computer technology, make the three colors have 256 gray levels and arbitrarily mix, can produce 256x256x256 (16777216) colors, forming a combination of different light colors. LED combination of light and color change, can achieve rich and colorful dynamic change effects and various images.
11. Less heat emission
LED is a more advanced cold light source, the cold light source is almost no infrared spectrum light source when objects emit light, its temperature is not higher than the ambient temperature, it does not radiate a lot of infrared and ultraviolet rays like incandescent lamps and fluorescent lamps, especially suitable for the lighting of cultural relics, jewelry, high-grade cosmetics, and other valuables. Almost no incandescent lamp like the current thermal effect, will not be heated expansion and contraction of the impact of the bubble. It will not make the bulb yellow, will not accelerate the aging of lamps, and will not constitute a greenhouse effect on the surrounding environment.
12. Small and handy
LED is basically a very small chip, which is encapsulated in epoxy resin, so it is very small and light. It can save a lot of materials and space in the production and application.
13. Dimming function
There are many ways to realize the dimming function of an LED lamp. The switch dimming is to adjust the light through the power switch of the original lamp. There is no need to add any dimmer when using and installing. As long as the number and speed of the original power switch are continuously pressed, the dimming of the lighting lamps can be achieved to meet the different brightness requirements of individual needs. This kind of dimming method is the lowest cost among all the dimming methods, so long as a switch is replaced, the dimming lamps can be used normally without any additional installation costs. The SCR dimming mode usually only needs to replace the original power switch with the SCR dimming switch, and the different brightness can be achieved by rotating the knob of the dimmer.
When the analog dimming is installed and used, a 1-10V dimmer switch should be configured, and a group of 1-10V dimming signal lines should be connected to the LED lamp driver for dimming. PWM dimming can also be called digital dimming. It can be made into a wireless network by digital programming for 0-100% dimming. The dimming effect is very good and the overall cost is relatively high. It can be used in intelligent occasions with high requirements. For example, MCU control LED brightness, using PWM technology. LED display can display different colors, and PWM technology is also used to adjust the brightness of the three-color LED. And household LED lights can also be dimming in two ways, one is to adjust the capacitance of the resistance-capacitance current limiting circuit; the other is to control the current conduction angle with a thyristor.
14. Cost saving
The biggest characteristic of LED lamp is significant energy saving and long service life, so its economy is mainly reflected in the high utilization rate of electric energy, compared with incandescent lamp and fluorescent lamp, the LED lamp has the highest power conversion rate, that is, under the same lighting conditions, LED lamp consumes the least electric energy. LED lamp uses ultra-bright high power LED light source, combined with high-efficiency power supply. It can save more than 80% of electricity than a traditional incandescent lamp, and its brightness is 10 times that of an incandescent lamp under the same power. Using LED lights can save a lot of electricity every year. The average service life of an incandescent lamp is 1500-2000 hours, the average service life of a fluorescent lamp is 500-7000 hours, and the average service life of an LED lamp is 50000 hours, so the replacement cost is low.
The LED lamp can be used in 85V ~ 264Vac full voltage range constant current, to ensure life and brightness is not affected by voltage fluctuations, universal worldwide be in common use. Moreover, the installation of an LED lamp is simple, no need to bury cable, no ballast, and so on. It can be directly installed on the lamp pole or nested in the original lamp shell. A general standard lamp holder is used for an LED lamp, which can directly replace a halogen lamp, incandescent lamp, and fluorescent lamp. For example, an LED bulb can directly replace the existing energy-saving lamp and ordinary bulb products with Tongxiang E27, E14, GU10, and B22 interfaces, without any changes, and without the help of any technical personnel or professionals, DIY can easily change from ordinary lighting to LED lighting.
16. Vibration resistance
The basic structure of LED is an electroluminescent semiconductor material chip, which is solidified on the bracket with silver glue or white glue, and then the chip and circuit board are connected with silver wire or gold wire, and then sealed with epoxy resin to protect the internal core wire. Finally, the shell is installed, so the anti-seismic performance of the LED lamp is good
17. Cold temperature operation
LED lighting performs well in a low-temperature environment. Low-temperature lighting refers to the use of the artificial light sources for lighting, and the ambient temperature is below 5 ° C, such as refrigerators, freezers, refrigerators, low-temperature factories, outdoor lighting, etc. LED application in low-temperature lighting has the following special advantages. Even in the low temperature environment of - 40 ℃, LED can start instantaneously without special circuit or program design; the luminous efficiency of LED in low temperature environment is almost not affected, and may even be better than that in a normal temperature environment.
LED are a point light source with small volume and light pointing characteristics, which can be arranged in the refrigerated cabinet, display rack, and other places according to the design requirements, and the LED can In order to provide sufficiently uniform illumination to better see the goods and labels; LED light color, color temperature, color rendering are variable, according to the different lighting requirements of different products, choose the appropriate LED light source to achieve the purpose of attracting consumers; for the difference between LED and CCFL before power supply, CCFL first needs to go through the buck DC / DC converter, which will consume 10% of the power, and then through invert Er consumes another 25% of the power, and only about 70% of the power is supplied to the fluorescent tube. But led only needs LED driver to supply power directly, which makes the efficiency of the whole transformer circuit as high as 90%, which has great energy-saving advantages.
18. Pure DC operation
LED is a low voltage, current-driven device. This feature enables LED lighting to utilize the low voltage DC distribution network. The advantages of DC are: when the same power is transmitted, the wire used for DC transmission is only 2 / 3 ~ 1 / 2 of that of AC transmission In the cable transmission line, DC transmission does not produce capacitive current, while AC transmission line has capacitive current, causing loss; when DC transmission, the AC systems on both sides do not need to run synchronously, while AC transmission must operate synchronously; the loss caused by DC transmission failure is smaller than that of AC transmission; stable DC does not produce electromagnetic radiation because it only produces electric field The alternating magnetic field, even if it is ultra-high voltage direct current, is only strong enough to ionize the air and emit light. At this time, the light radiation is produced by air ionization, not by wires, and does not produce electromagnetic waves. In the DC transmission line, all levels are independently regulated and operated and have no influence on each other. Therefore, when one pole fails, the fault pole needs to be stopped, and the other pole can still transmit no electricity, However, in AC transmission lines, if any phase fails permanently, the whole line must be cut off.
Digital semiconductor LED lighting is the integration of single-chip microcomputer technology, computer network technology, and large-scale database management technology in the semiconductor LED lighting system. Through the computer network subsystem and data acquisition subsystem, the energy consumption of lamps and lanterns in the lighting area, the operation status and the operating environment (such as power grid parameters, environmental temperature, and humidity, etc.) can be monitored in real-time, and the abnormal operation state warning can be provided. At the same time, the manager can control the switch of lamps and lanterns in different areas. The digital LED lighting control system includes a remote control, management center, digital meter, concentrator, and LED light monitor. The digital meter is connected with the management center, the management center is connected with the concentrator on the backbone network, and the concentrator is connected with the LED light monitor on the subnetwork. The complete semiconductor functional lighting should be digital.
It has obvious advantages over the traditional incandescent lamp, fluorescent lamp, and metal halide lamp in the aspects of color performance, light control ability, environmental protection, and energy conservation, advanced degree of working condition monitoring, and convenience of the maintenance system. It can achieve high-level, high-quality, and energy-saving lighting effect Digital lighting will bring a new revolution to human's lighting concept and application.
20. Directional lighting
LED lighting has the function of directional emission because of its directional emission mode and high-throughput density. Because almost all power LEDs are equipped with reflectors, and the efficiency of these reflectors is significantly higher than that of lamps. In addition, the efficiency of its own reflector has been included in the detection of LED luminous efficiency. The road lamp using LED is to use the directional emission characteristics of LED so that each LED in the road lamp can directly direct the light to each area of the road, and then use the auxiliary light distribution of the lamp reflector to achieve a very reasonable comprehensive light distribution of road lamps. LED street lamp directional luminescence can irradiate the light of the LED street lamp to the required lighting area, which further improves the lighting efficiency and achieves the purpose of energy saving.
Disadvantages of LED Lighting
Although an LED lamp is undoubtedly a milestone in the history of electrical lighting, it also has some problems.
LED lighting has a higher investment cost than traditional light sources. However, please keep in mind that the lifespan here (more than 10 years) is much longer than ordinary light bulbs, and at the same time, its energy consumption is several times less than that of old-style light bulbs. In the process of using good quality LED light source, we will be forced to buy the minimum. 5-10 old bulbs will not necessarily save our wallet.
2. Temperature sensitivity
The quality of the diode's lighting depends largely on the ambient operating temperature. At high temperatures, the current parameters flowing through the semiconductor components will change, which may cause the LED module to burn out. This problem only affects places and surfaces that are exposed to very rapid temperature rises or very high temperatures (steel plants).
3. System reliability
The reliability of the LED system will depend on all its components and their ability to withstand environmental or working pressure. Most LED parameter failures (such as lumen depreciation and color shift) are related to temperature, while most catastrophic LED failures are related to the driver. Only the weakest link in an LED system is effective, and the driver is usually this link. The driver is the heartbeat of the LED system because it is responsible for executing many subtasks sequentially or in parallel. Among these subtasks, protecting LEDs from power surges and poor input power quality is especially important, because catastrophic LED failures are usually caused by EOS events. LED drivers usually use electrolytic capacitors to absorb surge energy, eliminate large output current ripples and filter EMI. The life of an electrolytic capacitor depends to a large extent on the operating temperature and the ripple current flowing through it. This makes the driver itself often the first component of the LED system to fail because low-cost drivers rarely use capacitors with high operating temperature capabilities. The linear power supply can work without electrolytic capacitors, so it has higher circuit reliability. However, LEDs operated by these circuits are subject to excessive electrical stress.
Among the variables that affect lighting quality, flicker control, and color quality are usually replaced by lower-cost system designs. As mentioned earlier, flicker occurs when there is a large ripple in the DC current. Low-cost driver solutions such as single-stage SMPS circuits or linear regulators often perform poorly in terms of ripple rejection. The lighting industry is also obsessed with providing lighting products with a low color rendering index (CRI) and high color temperature. This is due to a trade-off between luminous efficiency and spectral quality. In order to provide high color rendering lighting, the light source must evenly distribute the radiant power in the visible spectrum. This involves the down-conversion of a large number of short-wavelength photons (such as blue light). The greater the conversion of short-wavelength photons, the higher the Stokes energy loss. This leads to lower efficiency of LEDs with higher color rendering performance.
5. Performance consistency:
For most applications, it is difficult for LED users to set strict specifications for flux and color. The color range is usually used. The challenge lies in the following issues: LEDs produce color distribution (wavelength or color-corrected temperature, CCT), light output (intensity or luminous flux), and forward voltage/efficiency (Vf or lumens/watt) when they are manufactured. It is very important to produce matching colors and light output in multiple luminaires; whether it is a fixed or permanent installation, it is essential. The color change in the LED array is a basic design consideration, especially for applications such as wall washing, where the differences between adjacent LEDs can produce unexpected color effects on the target surface.
6. Light pollution
Glare and overflow light and halo effect light are called light pollution. Due to the nature of its design and operation, LEDs produce directional light output. LED is a small, concentrated directional light source, when used for general lighting, it may often produce glare. In particular, glare and spill light are well known and are indeed a serious problem for high-intensity wide-area lighting. In these applications, since the brightness of the light from the lighting fixture at a high place is in contrast with the darkness of the sky, glare is generated. Glare can be very annoying and uncomfortable.
When there are sufficiently large fluctuations in the DC current supplied to the SSL, flickering and other visual abnormalities sometimes occur. The flicker of electric lighting is usually caused by the time change of the power source of the light source. Flicker in LED lights may occur, mainly because these devices are usually driven by LED drivers with regulated power supplies that provide stable current and voltage to the LED lights through an AC power cord. The LED is powered by a predetermined power supply unit to emit light. When the power provided by the power supply device is unstable, the light emitted by the LED may flicker, which is a sign of malfunction. That is, when the current waveform of the power supplied to the LED is unbalanced, the flickering of the LED occurs.
8. Blue light pollution:
Since cool white LEDs with higher color temperatures emit proportionally more blue light than conventional outdoor light sources (such as high-pressure sodium vapor lamps), the strong dependence of Rayleigh scattering on wavelength means that cool white LEDs The light pollution caused is more than other light sources. The International Dark Sky Association discourages the use of white light sources with a correlated color temperature higher than 3,000 K.
9. Impact on insects
Compared with sodium vapor lamps, LEDs are much more attractive to insects, so that people have been worried about the possibility of destroying the food web
10. Use in winter
Compared with traditional electric lights, they emit less heat, so LED lights used for traffic control may be blocked by snow, which may cause accidents.
11. Luminous attenuation
The LED core is prone to local (within 1 mm) high temperature, which will make the brightness of the LED decrease after a period of use. Poor quality LED lamps and lanterns may have a light attenuation of about 20% every 1000 hours. However, medium and high-end LED lamps (through excellent chip and lamp heat dissipation design + constant current source power supply) basically solve the problem of light attenuation, and products with zero or low light attenuation have been put on the market in large quantities. The attenuation can be less than 3% per 10000 hours, or basically 0.
12. Low power
The power of a single LED light-emitting unit is small, and the total luminous flux is low. To achieve the brightness of traditional lamps and lanterns, dozens or hundreds of light-emitting units are needed. This increases the production cost and production difficulty and increases the failure rate.
13. Harmful to eyes
In order to pursue the brightness, people usually strengthen the blue light intensity of the LED. The longer the lighting time is, the faster the phosphor decays, which leads to the stronger light intensity of blue light band that human eye contact, thus causing harm to human eyes.LED lamps to have certain adverse factors in the use of LED navigation indicator, LED street lamp, and led table lamp in road traffic. It is easy to make people feel dizzy and uncomfortable in the process of use. Even long term use will cause eye damage, which will increase the probability of eye disease.
14. Narrow luminescent surface
LED needs to be large-scale integrated on the circuit board because of the narrow single light-emitting surface, which will cause a large amount of heat accumulation and sometimes break down the circuit board. So the heat dissipation of the LED lamp must be better.
15. Toxic elements
LED lamp contains antimony, arsenic, chromium, lead, and other metal elements. Among them, the content of toxic elements in some LED lights has exceeded the standards set by the regulatory authorities. For example, in low brightness red LED lights, the researchers found that the lead content exceeded the standard by 8 times, and the nickel content exceeded the standard by 2.5 times. In fact, in California law, most LED lights are clearly defined as toxic waste, which will pollute the soil and groundwater if it is treated by ordinary landfill. If the LED lamp is broken, it may also cause damage to human health in direct contact. Arsenic, lead, nickel, and copper in LED have the most serious impact on the human body and environment.
16. Complexity of usage:
LED can not be used as a common light source simply; it should be used to drive the power supply, optical and heat conduction coordination.
17. Not good irradiation effect
The light source of the LED lamp is white light. Due to the individual defects in the manufacturing process and the matching error of the lens, it is easy to form a yellow circle when an LED lamp is used, which will affect the lighting effect of the lamp.
18. Limited area of use
The illumination brightness is small, not suitable for large area lighting. In the initial stage, LED lighting is mainly used in large-scale landscape lighting, not suitable for high eye environment.
19. Slight noise
When the LED is working, there is a slight noise due to the cooling through the fan (the relationship between the structure of the heat sink and the fan)
20. Limited Lamp Design
Special optical characteristics of LED need to be considered. It refers to the negative influence of the optical system and lamp structure on the luminous flux of light source, the pollution of dust and particles in the external environment on the optical system leads to premature weakening of illumination. In the design process of lamps and lanterns, the problem of light attenuation should be taken into account in the selection, shape, volume, and sealing mode of the reflector.
The above article summarized 40 advantages and disadvantages of LED Lighting. If you have different views, please leave a message to supplement the discussion.