How to balance the luminous efficacy and light quality of LED lighting fixtures?

Hits:Updated:2018-10-11 17:10:00【Print】

The radiant flux Φe marked in red in the report is the optical power. From the perspective of energy conservation, the LED consumes 31.21W of electric power, and 11.97W (accounting for 38.36%) becomes optical power, 19.24W (61.64%). Converted into thermal power, emitted 3922lm of light.
If you do not consider thermal power (pretend to consume only 11.97W), the ultimate luminous efficacy or optical performance (LER) that this device can achieve is:
What kind of ghost is Light Vision (LER)?
Above we talked about a professional term light performance (LER), but mom, what is this ghost? Ask me urgently.
Now suppose that we have invented an ideal LED that does not generate heat and converts the electric power P100% into the optical power PV. (In the theoretical world, ideals still have to be, although they can’t always be realized)
At this time, the luminous effect is the theoretical maximum. This value also has a scientific name called luminous efficacy of radiation (LER).
The theoretical calculation formula of LER is as follows (I know you can't read ~~):
The Km in the formula is called the maximum optical performance, which is equal to 683lm/W, which means the most sensitive yellow-green light (555nm) of the human eye. The optical power of 1W is equivalent to 683lm luminous flux.
When the shape of the spectrum is determined, the optical performance (LER) is determined. (Is there a portable artifact in the spectrum? Do you know?)
The theory and formula are not good (yong) understand, let's take another chestnut.
In the above picture, we can see that the luminous efficiency (LER) of the halogen lamp is only 130lm/W, which means that the theoretical maximum luminous efficiency of the halogen lamp is 130lm/W, mainly because the spectrum of the halogen lamp contains a lot of red. Light, seen from the visual function V(λ) (shown by the dashed black line), these red light human eyes are insensitive, resulting in a lower light performance (LER).
LED1 removes more red light. Most of the spectrum is yellow-green light that is sensitive to human eyes. Therefore, the optical performance (LER) can reach 330lm/W, but because of the red light, the index is only 80.


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