How can something be near perfect CRI with a big blue spike?

R12 is not counted in th Ra value, only R1 to R8.

Rf (TM-30) which is an average of the 99 color samples at the bottom of the report is lower (90) because it takes several blue samples into account.

Interesting. Anyone have any idea how much this blue spike subjectively affects light quality?

Not much I’d say, what the data shows is that blues are more saturated and tend towards purple (color vector graphic), in reality I think this is difficult to see.

Edit :

I don’t think we can see 700nm

To help verify the CRI of your particular flash, all ya have to do is get the Ozark Trail OT 50L at yer local Walmart for $1.00 as stated in my signature.

This will tell you if the TCR matches the CRI that you thought should be there.

Nothing can better define your particular unique flash’s CRI expectations than reality. :student:

Did you make TCR up based on a particular emitter you like? Wouldn’t NCR be more accurate? (nottawhackjob color rendering)

730nm far red lights exist and you can see them ok but they are a lot dimmer than shorter wave red lights.

TCR is a subjective rating to a particular flash. Every flash is different. Hence every emitter is different. Granted, web-consensus can then become a strong or even better indicator of production consistency. This is where TCR fills a gap that CRI can’t provide.

If you think your eyes are inferior to CRI then ya shouldn’t care. Just buy watt the CRI sez and if you’re unhappy with watt ya got then ya can blame CRI, right? :student:

Seems like CRI can help people make educated guesses about what they might like and tm 30 is even better.

I never said it didn’t. :student:

Butt in the end of it an educated guess is still a guess, right?

Looking a a few 730nm LED Datasheets a part of their spectrum are in the Visible range which would be what we would see, just like an UV LED also emits in the visible range.

What do beam shots look like—does a blue tint dominate the beams of these two?

Depends on the lighting and tint bin. The sw45k seems fairly tightly binned and most people would say the SW45k is pink, but it is blue compared to warmer lights or at night. I have had 3 bins of the SST-20 4000k and they range from yellow-green to white-blue-pink in tint.

Interesting. Our Bundesamt für Strahlenschutz BfS gives a range of visible light up to 780nm. Is this a mean/max thing? Or don’t I understand the photopic luminosity function (likely :smiley: )?

Question for all.

Are you willing to trade tint or color temperature for TCR?

I'm sure some people are willing to make a trade off for CRI, but "TCR" isn't a real thing.

I’m not convinced “TCR” raises the quality of discussion. It seems more like a distraction from the subject of the thread.

Whacky, your signature grows at a frightening speed. Is there really no limit, or have you found a way around it?

There is no limit on how big a signature can be, but if it gets too big people might complain.

I think it has found a limit. For now. :laughing:

I’ll reduce it when more and more understand and accept the reasoning behind TCR.