Advantages of LED
Small capacity
LED is basically a very small chip, encapsulated in epoxy resin, so it is very small and light.
low power consumption
LED power consumption is quite low, driven by DC, ultra-low power consumption (0.03-0.06 watt per tube), and electro-optical power conversion is close to 30%. Generally speaking, the working voltage of LED is 2-3.6V, and the working current is 0.02-0.03a; That is to say, it consumes no more than 0. 1W, and the same lighting effect saves nearly 80% energy compared with traditional light sources.
Long service life
Some people call LED light source longevity lamp. It is a solid cold light source, encapsulated by epoxy resin, with no loose parts in the lamp body and no shortcomings such as easy burning, thermal deposition and light decay of the filament. Under proper current and voltage, the service life can reach 60,000-65,438+10,000 hours, which is 65.438+00 times longer than that of the traditional light source.
High brightness, low heat
LED adopts cold light emitting technology, and its calorific value is much lower than that of ordinary lighting.
environmental protection
LED is made of non-toxic materials, unlike fluorescent lamps, which cause pollution and can be recycled. There are no ultraviolet and infrared rays in the spectrum, and there is no heat and radiation. It is a cold light source with small glare, so you can feel at ease. It belongs to a typical green lighting source.
sturdy and durable
LED is completely encapsulated in epoxy resin, which is stronger than light bulbs and fluorescent tubes. There is no loose part in the lamp body, which makes the LED not easy to be damaged.
How changeable
LED light source can make use of the principle of three primary colors of red, green and blue, and under the control of computer technology, make the three colors have 256 gray levels and mix them at will, which can produce 256× 256× 256 =16777216 colors, form a combination of different light colors, and realize colorful dynamic change effects and various images.
current technology
Compared with the monotonous luminous effect of traditional light sources, LED light sources belong to low-voltage microelectronic products. It successfully combines computer technology, network communication technology, image processing technology and embedded control technology. , so it is also a digital information product, a "high-tech" technology of semiconductor photoelectric devices, with the characteristics of online programming, unlimited upgrade and flexibility.
LED shortcomings
Toxic element content
LED lamps contain antimony, arsenic, chromium, lead and other metal elements. Among them, the content of toxic elements in some LED lamps has exceeded the standards set by the regulatory authorities. For example, in low-brightness red LED lamps, 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, the vast majority of LED lamps have been clearly defined as toxic waste, which will pollute the soil and groundwater if treated by ordinary landfill. Moreover, if the LED light is broken, direct contact may also cause harm to human health. Arsenic, lead, nickel and copper in LED have the most serious impact on human body and environment.
The light emitting surface is relatively narrow.
Because the single light-emitting surface of LED is relatively narrow, it is usually integrated on the circuit board on a large scale to form a relatively large light-emitting source, which will cause a lot of heat accumulation and sometimes break down the circuit board. Therefore, the heat dissipation of LED lamps must be good.
Harmful to the eyes
Blue light and ultraviolet light (that is, ultraviolet light) are the most unacceptable to human eyes. The ability of blue light to kill human active cells is 10 times that of green light, and the ability of ultraviolet light to kill human active cells is 10 times that of blue light. Long-term exposure to a large number of low-wavelength blue light will kill a large number of human eye active cells, and eventually cancer will form plaques. The formation of LED white light mainly depends on blue light with wavelength of 450-455NM to excite phosphor, and the lower the wavelength, the stronger the excitation ability. Generally, the wavelength of LED is controlled within 500NM, that is, 450-455NM or 455-460NM, which is the most harmful section. If the wavelength becomes larger, the ability to excite phosphors will decrease and the efficiency will decrease. In order to pursue brightness, people usually strengthen the blue light intensity of LED. The longer the illumination time, the faster the phosphor decays, which leads to the stronger light in the blue band that human eyes contact, thus causing harm to human eyes.
Therefore, there are some disadvantages in the use of LED lights in road traffic, such as LED navigation instructions, LED street lamps and LED desk lamps. It is easy to make people feel dizzy and uncomfortable during use, and even long-term use will cause eye injuries and increase the probability of eye diseases.