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 
)?
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.
Yeah you have a point. Didn’t mean to distract at an expense. I’ll start my own thread on this subject. Maybe.
Don't hold your breath.
TCR will never take off because it is subjective, and not scientifically measurable.
I think you’ll be proven wrong.
PS. It’s Autumn’s thread. I’ll respectfully bow out of it.
If I was to make a guess, while those LEDs still have a significant blue spike and overall different spectral makeup than a blackbody source the difference is insignificant compared to what a lower-Ra LED or florescent would have. The latter two have HUGE gaps in the spectrum that are underrepresented vs blackbodies. Since color of an object is determined by reflected light, the slight differences in intensity of some wavelengths doesn’t matter as much for accurate color representation (since much of the light is being absorbed anyway) vs a segment/segments of the spectrum being extremely low relative the others.
About OP’s question: we do not see 450nm very well, our eyes are just 4% as sensitive to it as our peak at 555nm. So a spike at 450nm is not obvious. The blue is needed for natural colour perception, but the amount appears not very critical, although real snobs may see it.
Same for deep red, we hardly see it so it is not critical for how we perceive colours, but it does help for that last tiny bit of colour rendition.
In general: our machines detect light way better than our own detectors: our hopelessly primitive eyes. It must be noted though that we have brains that are extremely capable of squeezing every last bit of colour information out of our very poorly functioning eyes.