1. The color temperature and brightness

Color Temperature

Unit: absolute temperature (Kelvin, K)

K color temperature to represent the absolute temperature, is a standard black body (such as platinum) is heated, the temperature rises to a certain extent when the color began to red, orange, yellow, green, blue, indigo (blue-violet), purple, gradually change, with such changes in the characteristics of light color, its color and the black body light source light hue, we will call the temperature of the black body at the time the color temperature of the light source. When the color temperature of about 3000K, light yellow color. 5000K color temperature is above, light color blue. Different color temperature of light, with different lighting and visual effects. Different color temperatures corresponding to different colors of light in the following figure. Giving the eyes caused by different wavelengths of different color perception, from red, orange, yellow, green, blue, indigo (blue-violet), purple. The sensitivity of the eye changes with the wavelength of which varies strongly.

For example, under good lighting conditions, the eye sensitivity to light of wavelength 550nm (yellow) is 20 times as red or blue. This is why most of the car's fog lights and street lights use a yellow important reason. Color temperature is a measure of the standard color temperature, not measure the brightness of the lamp. Halogen 2300K color temperature can be made to 7000K; HID lamp color temperature from 4200K to over 8000K; the higher the color temperature of light, its fog and rain penetration worse (not light). Manufacturers such as Philips has produced only the highest color temperature of 6000K Xenon lights. The following is a different color temperature performance:

Light color temperature of the light effect

3000K yellow light, strong penetrating power

4200K white with yellow, the original car with xenon lights

5000K light all white, the color temperature of the highest European regulations

6000K light all white, bluish

6500K under the sun during the day

Significantly bluish white 7000-8000K

8000K above blue light, poor penetration recommended color temperature of about 6000K is just slightly the white color temperature began to turn blue, the human eye is easy to accept, fatigue, increased security, and the halogen is poor.

2. Select the LED light source need to focus on nine basic performance

As the herd of market, as consumers, the choice is still to be calm, scientific analysis, the choice of the best cost-effective light sources and lamps, here are some of the basic properties:

(1), brightness of different brightness, different prices. For lamps shall comply with the Laser Class Class Ⅰ standards.

(2), antistatic ability antistatic ability and long life, and therefore higher prices. Usually static than 700V can be used for lighting.

(3), wavelength wavelength coherent, consistent color, such as requiring the same color, the price is high. No spectral separation device manufacturers is difficult to produce pure colors.

(4), the leakage current is one-way conductive light, if there is reverse current is called leakage, leakage current is large, short life, low prices.

(5), which uses a different light angle light angle is not the same. Special light-emitting angle, and higher prices. If all diffusion angle, higher prices.

(6), different quality of life is the key to life, life is determined by the light fades. Light decay, long life, long life, high price.

(7), wafer wafer luminous body, different chips, prices vary widely. Japan, the United States more expensive chips, chip prices are generally lower than that made in Taiwan and Japan, the United States.

(8), the size of the size of the wafer to wafer side, said large wafer quality is better than small chips. Chip size is proportional to the price of the same.

(9), colloidal colloidal ordinary general epoxy, plus a UV resistant and fire retardant price of expensive, high-quality outdoor lighting should be UV and fire. Each product will have different designs, different designs for different uses, lighting design reliability include: electrical safety, fire safety, applicable environmental safety, mechanical safety, health and safety, safe use of time and other factors. From electrical safety point of view, should comply with the relevant international and national standards.

Because it is a new product, the Chinese national standard lag, but the state provides product qualification testing. With international safety certification (such as GS, CE, UL, etc.) and national product quality certification of lighting the price is higher, because these products are designed to be safe and reliable. Consumer attention is to carefully identify the certificate of authenticity, there are now international safety certification and national product certification are not many manufacturers.

From the health aspect, the use of non-toxic materials designed product prices to be high, especially indoor lighting, do not choose the smell of cheap lighting, currently only a handful of manufacturers are producing non-toxic materials, can be directly used to identify ways respectively nose, the smell of the product much lower price than those without odor. Professionals need a similar analysis of lead, mercury, cadmium and other toxins. From the application of environmental security perspective, a reliable dust-proof design, material fire, UV, anti-low temperature cracking product prices high.