u like warm tints eh
The d=67mm optic could be a bit too large, but we have seen much bigger heads already.
Edit: Maybe it is really not the best idea, as it needs much precise alignment work with E21A - so you have your point right there.
The d=50mm optic configured as triple quad E21A could be much more manageable with either single 26650/21700 or triple 18650.
Edit: The 12 degree spot and 16 degree medium beam optic with beaded surface should be already nice even, but this 35 degree medium beam optic with frosted surface should be super creamy.
I think it would worth definitely implementing a flashlight with two of these optics as available choice.
Me too. :money_mouth_face:
Sure do! 
SST-20 3000K is a great LED with high R9. A cheap and easy way to make it better is to add a minus green filter.
Try adding a Lee Zircon 803 (weaker) or 802 (stronger) minus green filter before you decide to do an emitter swap. In my experience SST-20 3000K paired with a minus green filter looks better than Nichia 219B R9050 sw30.
Possibly, but I bet it does not look better than Nichia 219b R9080 sw30.
Yeah, mine has been shipped today. Nice cyan KR1 w/ XP-L 4000K 
.
I’d like to request that the first person to try out a hollowed out artificial candle as a diffuser for a 2200K KR4 share a short video clip of the result, preferably next to a real candle for comparison.
It just seems to me like this should work really well.
“Candle shows different color temperatures (CTs) at different positions inside the flame. The CT varies from 1847 to 2626 K for the white candle studied
herein. To represent, the CT of the brightest spot is chosen, which is 1914 K”
The CRI value for this candle is 83
“a candle with 1914 K and an 83 CRI”
Candles are normally about 1800K overall and 100 CRI.
Source for that 100 CRI?
When someone claims something they need to quote a study. Google is not a source is a search engine which will give you all the results you want and you don’t want.
That is why I have posted above a quotes from a study.
They don’t give any explanation for how the flame deviates from a black body spectrum. In my opinion that is incomplete, especially when they are attempting to use that 83 CRI number to show that their LED somehow gives off “better” light than a candle.
They don’t need to, but I always appreciate when someone is able to quote a study, especially if the claim does not match my expectation.
To get to the point, even sunlight does not perfectly replicate its own reference, which above 5000K is a standard illuminant that mixes direct sunlight and scattered skylight, in reality varies. I’d be somewhat curious to see measurements of sunlight at different times of day to see how measured CRI and DuV changes, and whether it ever quite measures 100, or tends to stay in the 99.x range.
Below 5000K, the reference for CRI is a theoretical black body, and there can again be some differences because of absorption and discrete emission effects that I assume are present. It should be extremely close 100, but I’ve also never seen an actual candle measurement.
I’m particularly curious about thorium mantle lanterns, because I know they have some strong discrete emissions, and might as a result be quite significantly short of 100 CRI.
- Edit - just saw the paper linked above has a CRI measurement. I’m reading the paper now. 83 CRI surprises me and raises some questions, such as whether that is an integrated measurement.
That paper I suspect may not be accurate. We have people with spectrometers here on these forums that can run those tests easy to verify the claims. Mantle lanterns were already tested here. The mantle in question has a 98 CRI, essentially perfect.
Integrating toilet, measurement taken from about 18” directly above:
Pretty great CRI and the steak house is pretty good too.
Can anyone be so kind and explain what does R9080 or R9050 mean or the difference? Is that the CRI of the led?
It’s Nichia terminology. First two numbers are CRI and last two are CRI (R9). I believe it’s the minimum or average? that bin is rated for.