1. What is the white light that can be used for illumination?
The white light of the illumination must have a color rendering index and a comfortable color temperature. Both natural and incandescent light are endowed by nature. It is the goal pursued by artificial light sources made by humans. They represent the ideal light source with a color temperature index close to 100 for high color temperature (above 5000K) and low color temperature (below 3000K). so far. In addition to incandescent lamps (low color temperature) and xenon lamps (high color temperature), artificial light sources have almost no such good color rendering.
Then, in all the current lighting applications, it is not necessary to have a color rendering index of 100 for the application. Isn't the fluorescent lamp with a color development of only 50 calcium halophosphate phosphors used for more than half a century? The high-pressure sodium lamp with a color rendering of only about 20 is not applied on the road for half a century? Therefore, it cannot be generalized. According to the surrounding environment and conditions of use, we must draw a good and bad boundary.
However, in the context of today's technological development. It is undeniable to see such a fact:
1. Green and low carbon require us to use light sources with higher luminous efficiency to meet the goal of reducing energy consumption. New products must have high luminous efficiency. For example, the luminous efficiency of a light source made of a fluorescent lamp made of a tribasic phosphor instead of a calcium halophosphate phosphor can be increased by about 50% (from 22501m (40W calcium halophosphate fluorescent lamp) to U3350 Im (36W---" basic color fluorescent lamp) )): Colored LEDs have completely replaced the traditional white light source plus color filter for this colored light mode, and so on:
2. Color rendering has gained more and more attention. Light sources with poor color rendering are often not available or recommended in many applications. The clearest example is that the low-pressure sodium lamp has a luminous efficiency close to 2001m/W, but the monochromatic yellow light makes it only used for road lighting and very few other occasions. The indoor environment with a larger audience has higher color rendering requirements. Like the US Department of Energy (DOE), the color rendering index for LED lamps used for indoor lighting has increased from the original 70 (2007, 8) to the recently specified ≥ 80 (2009.12) H]. In the domestic lighting design standards, it is also stipulated that the color rendering index in offices and hotels should be above 80. and also. The appearance of metal halide lamps with high color rendering index (Ra>80) has increased the color rendering in the lighting indicators of international stadiums from more than 60 to >80, all from this. So, what is the white light that can be used for illumination? White light with high luminous efficiency and high color rendering index and suitable for lighting environment or lighting work is the best white light. In the current situation, high luminous efficiency means higher luminous efficiency than conventional light sources. Because nowadays, different light sources are now playing the main role in different occasions. It is better to put a traditional light source with high luminous efficiency into the lamp as a benchmark, and then compare the new light source into the lamp (such as LED lamp). method. DOE currently has benchmarks for ordinary bulbs, MRl6 and fluorescent lamps. As for the color rendering index, the color rendering index in various occasions is a manually specified value, which is not specified in some occasions, such as outdoor lighting , and some have already made detailed regulations, especially in indoor lighting, such as home The color rendering index in the environment is above 80, which has become a customary requirement. Therefore, higher efficiency than conventional light sources and a color rendering index greater than 80 seem to be a measure of the white LEDs used in indoor lighting.
The trend of driving traditional light sources with LEDs has become clear. High light and low color rendering index have already emerged in some indoor and outdoor lighting, showing good results and strong development momentum, which must be noticed.
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