Quote:
Originally Posted by Quoth
A tri-colour R G B LED with no phosphors would be near zero CRI
Note that higher CRI (80 to 95) have lower efficiency than low CRI of 50.
https://en.wikipedia.org/wiki/Color_rendering_index
So an R G B LED source can be used for LCD backlights, and projectors onf any kind as those are not room illumination, but playing back a signal created by filtering the image to match the average human eye response to three channels, either R G B or brightness and two chroma channels. As the filterin was done at the camera or scanner, the display can use narrow R G B at approximately the peaks.
Pure R G B sources are terrible for actual general lighting. |
The multiple quantum well monolithic white LEDs can get a CRI into the high 80s, which is fine for lighting.
They're still (as far as I know) not ready for commercial use, but they do exist and I suspect it's only a matter of time.