It wasn't so long ago that I didn't know what the heck a de-domed emiiter meant!
This is, IMHO a fantastic thread! A clear dome over a LED emitter changes its beam characteristics. As has been stated in the thread, it most definitely plays a role in protection of the product while shipped in the logistical requirements of the manufacturers. That bare thin phosphor layer can't take much abuse when bounced around in shipping or what not. If completely protected already in a sealed flashlight head, it might not be so big a deal. As far as I have read and understand, the only de dedoming reason would be honorable and noble flashlight hackers who are trying to create the next generation of ultimate tight-throwing flashlights with whatever is on hand or available by part number.
Then again, maybe I don't know what I'm talking about. Were you really going to try soaking your emmitters in gasoline or acetone? This action by it self? I am sort of an old-timer. I recall an internet hoax about coating your computer modem in wax to make it go faster. For your newcomers, this is the thing that let you get on the internet once-upon-a-time.... with your phone land line. Anyway, I see a real purpose for de-doming. It's for the high end flashlight hackers and flashaholics seeking the ultimate long range throw with whatever parts they can get. We don't give a flip about what can be done 5 years from now. We want it now. Joe Flashlight doesn't need or want it because it introduces too many variables for a non-enthusiast to want.
Put it this way, would you strip the heatsink off of your computer processor because someone told you it would simply make it go faster? In the 386 PC processor days, that would be 100% fine, but it wouldn't have an effect. PC cpus didn't even have a heatsink back then, except for the newfound world of "overclockers." It was arcane magic back in those days, there wasn't a guide on Tomshardware, Anandtech, or HARDOcp to tell you how to do it. Oh wait, I didn't check to see if those sites even still exist! Anyway, those sites came later in the PPP-internet connection days. It was far from the text-only SLIP-unix days. Telnet and lynx? It is far from that simple, friends. It's far from that simple. It's related, however! Electrical engineering doesn't change much, it's just the components that get better! Emacs versus VI? Domed versus de-domed? Is it the same holy war without an understanding of the underlying architecture?
You're mostly exposing the reactive phosphor layer to open air and any contaminants that can get to it. If you had a hermetically sealed and nitrogen purged flashlight head, it should probably be okay... theoretically. Ever heard about nitrogen-purged rifle scopes? It's sort of the same problem and same solution. You *DID* know that phosphorous is used in MATCHES, right? Did you really want this to get super-hot in an oxygen environment? Are you seeing dark spots on the phospor layer of your emitter die? Is the light itself turning blue? People like me remeber the revolution that happened when white 5mm leds became possible. It was a brilliant hacker who CHEATED to make it happen. Everyone wanted a white led and all attempts failed. He made it work by "cheating" and using a blue emitter to blast a custom phosphor layer... it's something we take for granted these days.
I'm sorry. My lawn is full of holes. I try to tell people to get off of it, but I can never seem to do so in time. My poor lawn is half dead.
My lawn.
PS: CPF, I'd quit ya, if I only knew how, younger sister!