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How much LED color temperature is good for the eyes?

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2020-04-10 19:44

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Color temperature is the most general indicator of the spectral quality of a light source. Generally expressed by Tc. Color temperature is defined by absolute black body. Nowadays, LED lamps and lanterns are very common in life. There are various colors, so how much LED color temperature is good for the eyes? Next, Yijingyuan Broadcasting & TV will come to explain it for you. A report pointed out that white cold light LED and blue light LED are harmful to the eyes and should be banned. These LEDs are mainly used for decoration, and the intensity of blue light emitted by them far exceeds that of natural lighting and traditional lighting. These high-intensity blue light will cause damage to the pigment epithelium of the retina and the sensory layer of the retina at the same time, thereby accelerating retinal aging and increasing the risk of macular degeneration. The biggest victims of LEDs are children under 10 years of age. Children of this age have neither cloudy lenses nor macular pigment, so they lack the ability to resist blue light.

The LED lamp uses a blue chip and an external yellow phosphor to be mixed to produce white light, which makes the content of blue light in the LED lamp relatively high. Blue light refers to the blue light band of 400-500 nanometers. If the brightness is too high, the eyes may cause photochemical damage to the retina after looking directly at the light source for a long time. The degree of blue light hazard depends on the accumulated blue light dose received by human eyes under the light. According to national regulations, the color temperature of LED lighting cannot be greater than 4000K. However, due to the high light efficiency and relatively low cost of high color temperature LED light sources, there are many high color temperature products on the market.

Color temperature is the most common indicator of light source spectral quality. "Warm light" has a low color temperature, while "cold light" has a relatively high color temperature. After the color temperature increases, the proportion of blue radiation increases, and the blue light increases accordingly. At the same time, brightness also affects the proportion of blue light. Generally speaking, fluorescent lamps and LED lamps with the same color temperature are basically harmless as long as the brightness of the latter is not more than 3 times that of the former. However, for individual LED lamps that are too bright, the proportion of blue light may exceed the safe value. As the LED technology matures, manufacturers no longer need to blindly increase the color temperature and power of lamps to achieve high lumens, and objectively reduces the possibility of excessive blue light.

How to distinguish the positive and negative poles of SMD LED lamp beads

The meaning of common specifications and models of LED patches

On April 2, the National Standardization Management Committee issued an announcement announcing the postponement of the implementation of 13 national standards including the "Limited Values and Energy Efficiency Ratings of Unitary Air Conditioners".

The meaning of common specifications and models of LED patches

0603, 0805, 1210, 3528, 5050 refer to the size of surface mount SMD LEDs. For example, 0603 refers to a length of 0.06 inches and a width of 0.03 inches. But please note that the 3528 and 5050 units are metric. The following is a detailed introduction of these specifications:

It has proven useful! UV LED can kill 99.9% of coronaviruses in 30 seconds

Seoul Viosys and SETi announced that Vio LEDs UV LED technology successfully killed 99.9% of the new coronavirus (COVID-19) within 30 seconds. According to the news, the research team of Seoul Viosys and Korea University (Korea University) used the Violeds compound semiconductor technology in mass production for testing.

RGB and white LED

When it comes to the grievances and hatreds of white LEDs, we cannot fail to mention RGB and white LEDs. The two have the same goal in different ways. They all hope to achieve the effect of white light, but one is directly presented in white light, and the other is in red, green and blue. Mixed light; one said that the other party's purity was not enough and the price was too expensive, the other retorted that he was beautiful in color, and criticized the other party for being old and declining. I am afraid that such a war will not stop in the short term. However

How to distinguish the positive and negative poles of SMD LED lamp beads

Many packages, like some 0603, 0805 and other SMD LEDs, will have a green "T" symbol on the bottom. One horizontal side of the "T" is the positive pole, and the other side is the negative pole. Some SMD LEDs will be marked with a silk screen similar to a triangle symbol, so the bottom side of the triangle is close to the positive pole, and the top corner is close to the negative pole. The lead of the light-emitting diode is generally longer at the anode and shorter at the cathode.

LED light emitting diode

Light-emitting diodes are commonly used light-emitting devices that emit energy through the recombination of electrons and holes to emit light. They are widely used in the field of lighting. Light-emitting diodes can efficiently convert electrical energy into light energy. LED lamps and lanterns generally have the characteristics of long life, good lighting effect, and energy saving. Because of so many characteristics that are superior to other traditional lamps, they have a wide range of uses in modern society, such as lighting, flat panel displays, and medical devices.

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