So, will VR16SP4 still be available? Or is it a discontinued product that will be replaced by VR16SP4m?
I agree with you. 4xE17A may be useful when you want to archive a tighter beam with more candelas or in smaller flashlights, but 4xE21A most likely will be brighter and more efficient even with current incompatible optics.
Some numbers from ESTtool(E21A 3500K and E17A 3500K):
I’m quite surprised the E17A is not that far behind the E21A in terms of efficiency. If Clemence will ever make a 13mm board, I will buy a bunch. There’s so many AA/AAA/16340 lights I can think of that can use the 4xE17A
That depends on the current. On lower modes they are indeed very close(about 5% difference), except the fact that E17A has noticeably higher forward voltage, however on higher modes e.g ~700 lm E21A achieves 108 lm per watt while E17A only 93lm per watt and that’s already 16% which is not that small, at least for me, plus again higher forward voltage. Anyway, I’ll wait for the tests before drawing any conclusions.
I will be modding 3 identical hosts with quad e17a virence board, and I can’t decide on which CCT’s to pick.
The max output with these hosts will be about 260 lumens using the e17a 9080 LEDs, with both floody and throwy optics.
I typically enjoy lights from 3000K to 5000K, but have never tried 2700K, and sometimes find 5000K too cool.
Any recommendations?
Additional observation: mixing 2700K+4000K in different ratios would result in the 3000K or 3500K emitters almost exactly. Same goes for 4000K + 6500K which results in the tint for 4500K and 5700K.
So a quad e17a is about the size of an XP-G LED, and quad E21a is about the size of an XM-L LED.
Would you say the quad e17a will have about 40% more throw than the e21a at the same power setting?