I have dedomed multiple 219Cs. It’s quite hard as most of the time some of the silicone gets stuck on the phopshor, but with a sharp blade you can just barely remove it.
Tint is very warm (about 3000K):
LTR: 5700K nichia 219B, 4000K 219C with dome, 4000K 219C dedomed. White balance set to daylight
CRI doesn’t seemed to be affected. (Maukka confirmed that CRI doesn’t shift a lot with dedoming).
Throw is about what you would expect: About the same as XP-L Hi but thighter beam. (this is by eye and judging from distance so might not be 100% correct)
Thanks for the great beam comparison. I like that you used daylight white balance and shot all 3 beams together, and that one of them gives a Cool White reference. That all works really well together!
Dedome is not something you can be sure in finel result. You can find some old cree datasheet about chemical compatibility of leds with silicone dome - even regular leds require some limited conditions, otherwise output can decrease much faster than expected. Nobody knows how much output you will have after 100, 10 or even 1 hour of light with dedomed led.
Lux dont practice chemical dedome (only mechanical).
Lux applies custom dome to prevent fast led degrate.
Finally - his modules work inside sealed area without oxygen.
Again, I dont feel this information usefull for blf modders - since xpl-hi are available (black flat etc.)
I suppose you can find enough information about silicone optics pros and cons. Most optics manufactures started to use this material 3-5 years ago.
I have never seen Vinz re-dome LEDs. He has a method of removing th green tint after de-doming though (he calls it diamond treating).
There are some modders here who build hundreds of lights per year with dedomed LEDs. I have never read a single post in the last 5-6 years where somebody measured an actual loss of performance of time.
I also has Osram Oslon LCW CQAR.CC-MR-6L-L2 (from pargos-shop, 2 orders), and use it in 3 my flashlights with TIR-optics.
And I also can say : no any grinnich .
Perfect white color, slightly warm light, ~3900-4000K (color rendering slightly nicer, than in 2 my FC mkIV HiCRI Zebralight’s).
Yes, all hiCri led has lower low lm/w efficiency, that ordinary led’s, and these Osram Square series isn’t a “lumen champions”, but has excellent color rendering and (imho) tint (CQAR.CC 4000K 6L group).
If you prefer samsung 351D tint - it’s your choice.