I finally got around to reading your post. It will take a couple more reads for it to be knowledge, but I did learn a few things already
Iāve been wondering - how different is the behavior in color emitters - particularly, red and green version of pt-54, sst-90, xp-e, xr-e. Iāve got a green sst-90 sitting here thatās going in an 7g5v2 (aspheric) and iām wondering if I should dedome.
second question should get us back on topic. what are your thoughts on the size of the ārecyclingā reflector? The experiments referenced above used a 5mm ashperic aluminum collar - but wavienās is much bigger. Trial and error seems a very inefficient way to determine the ideal size - what does āscienceā say?
To my thinkingā¦the larger the reflector, the more accurate its surface and placement must beā¦and at some point, the intervening air space (and impurities?) could become a factor. But I canāt figure out why it shouldnāt be as small as possibleā¦
Dedoming color emitters - hm, difficult to say, since thereās no diffuse phosphor layer. Reflected photons might not change their angle and thus never get out; the die surface roughness would help a bit though. I assume that the net effect is quite less.
The original wavien collar was intended for the SST-90, thus the size - but it was placed directly onto the dome (if I remember correctly). Having no air gap between dome and LED would be a nice thing to have, but the XM-L or even XP-G2 are quite small, and the dome is not that much bigger than the die, which makes things a bit difficult. Since the die is an extensive source, a small reflector might block some light that would have hit the lens, or not reflect some rays that donāt hit it.
A bigger back-reflector can more selectively reflect only that light that really wonāt hit the lens, but it will have a harder job to really hit the die again.
Do you know anything about the collar in this pic? The reason I ask is the wavien callers I have look very different. That one has a much larger opening and appears to have some kind of plastic around the rim.
