The most comprehensive knowledge of LED lamp beads, characteristics and parameters
LED Lighting 2013-08-22 LED Technical Articles LED lamp beads are composed of chips, glue, phosphor, gold wire, and brackets.
Regarding LED lamp beads, there are many and very professional introductions on the Internet. For example, the introduction of LED lamp beads on Baidu Encyclopedia is very professional and detailed. I won’t repeat the professional introduction here, but I will give you a more popular introduction so that people without basic knowledge can understand and understand LED lamp beads.
To put it bluntly, the LED lamp bead is actually a small lamp. The final light is the chip encapsulated in the LED lamp bead, and the prerequisite for the chip to light up is conduction, and conduction is achieved through gold wires and brackets. So what is the role of glue and phosphor? Mainly to protect the chip and color matching. We have seen that LED lights that emit different colors are mainly realized by glue and phosphor.
Classification of LED lamp beads
According to power: it can be divided into low-power lamp beads (under 0.5W), medium-power lamp beads (0.5W), and high-power lamp beads (above 0.5W).
According to the packaging method: can be divided into straw hat lamp beads, patch lamp beads, COB lamp beads
According to the luminous color: it can be divided into white light, red light, blue light, green light and so on.
Features
1. High safety: The working voltage of LED lamp beads is generally between 3.0-3.5V, so the safety is high, even if electric shock, there is no danger.
2. Flexible application: Because of its small size, it can be used flexibly to make lights of various sizes and types.
3. Long lifespan: In theory, the lifespan of LEDs is 100,000 hours, while that of incandescent lamps is only 1,000 hours, and energy-saving fluorescent lamps are 8,000 hours.
4. Low carbon and environmental protection: It does not contain harmful substances, such as mercury and other heavy metals, so it is very environmentally friendly, and its high light efficiency determines its low carbon and energy saving.
5. High luminous efficiency: the luminous efficiency of incandescent lamps is about 15 lm/W, energy-saving fluorescent lamps are 50-60 lm/W, and LEDs are 100-120 lm/W (Cree Labs is 276 lm/W, February 2013 data).
6. High light quality: There is no ultraviolet light in the light, which is harmless to human health.
Parameter
1. Brightness: unit lm (lumens), the higher the lumens, the brighter.
2. Wavelength:
White light: warm color (color temperature 2700-4000K), pure white (color temperature 5500-6000K), cool white (color temperature above 7000K)
Red light: wave band 600-680, of which 620 and 630 are mainly used for stage lights, and 690 is close to infrared
Blue light: Band 430-480, of which 460 and 465 stage lights are used more
Green light: band 500-580, of which 525,530 stage lights are used more
3. Light-emitting angle: LEDs with different purposes have different light-emitting angles.
4. Antistatic ability: LED lamp beads with strong antistatic ability have long life and high price. Usually, only LED lamp beads with antistatic value greater than 700V can be used for LED lighting.
5. Leakage current: LED lamp beads are unidirectional conductive luminous bodies. If there is a reverse current, it is called leakage. LED lamp beads with large leakage current have short life and low price.
