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.
There’s a minimum order to meet, hence the last group buy. But I really don’t know how much 219Bs left in the warehouse. I have to check back to Nichia. I personally don’t want to stock them anymore. If you really have to use it then PM me.
Single E21A is the way to go, it’s very similar to 219B in performance and output. Rosy tint is another thing though…
EDIT: Yes, officially discontinued. We got the last batch from last year stock, you can see it from the bin labelling.