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by kkaske18 hours ago |
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upvoteby adrian_b4 hours ago|
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The article does not explain what they use, but it seems to imply that there is no fluorescent conversion layer and the white light comes directly from the LED.

That could be done if the LED actually contains a multiple structure combining red, green and blue LEDs, but in the past such a combined LED had the disadvantage that in time the efficiency of the 3 components degraded at a different rate, which resulted in a color shift.

For now, the luminous efficiency of this LED is quite poor, unsuitable for lighting but only for indicator LEDs or display applications, but they claim that for such small LEDs even the traditional LEDs had poor efficiency and they hope to improve the efficiency later to more acceptable levels.

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upvoteby mrheosuper2 hours ago|
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Does that mean the spectrum will have 3(or more) distinct spike at some wavelength , like old CFL ?
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upvoteby joshspankit16 hours ago|
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Indeed. Would love to see a spectrograph
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upvoteby wyager16 hours ago|
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Even if it's perfectly centered on a nice blackbody point, if the spectral distribution is spiky, it will still look bad in real-world usage
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upvoteby tdeck11 hours ago|
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Looking bad isn't necessarily a deal-breaker for many applications, not even for decorative ones. Just look at the piercing bluish white LED Christmas lights that many people have put up, rather than the somewhat more expensive "warm" colored ones.
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upvoteby nomel3 hours ago|
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It's is usually a deal breaker if used for room lighting, rather than display lighting. Especially where food is involved. Try swapping you dining room lights for RGB.
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upvoteby nomel13 hours ago|
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Not sure why this is downvoted. It's simple color theory, and the whole reason the CRI measure exists.
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upvoteby drjasonharrison6 hours ago|
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Unfortunately, CRI or Ra, agreed upon in 1974, is more of a "how well do eight pastels look when illuminated by this light spectrum?"

CIE's R96a (1999) remains stuck in a disagreement between scientists and manufacturers. This means that lights currently specified with a CRI value are advertising an inaccurate measure of their ability to reveal the color of objects.

https://en.wikipedia.org/wiki/Color_rendering_index

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upvoteby adrian_b4 hours ago|
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Knowing even only the 1974 CRI of a light source is much better than knowing nothing about it.

A very good CRI does not guarantee a very good color reproduction, but a poor CRI guarantees a bad color reproduction.

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upvoteby judge20209 hours ago|
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I've seen many very new comments start out grey until someone votes for it. No idea why that is.
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