S2+ UV light – Matte Black Reflector Mod

https://preview.redd.it/jg824gob0jrd1.jpg?width=780&format=pjpg&auto=webp&s=b4e2b1846463985d6f2522d2265fdce1c7c915d0

Planning to put together a humble UV build using Seoul CUN66A1G. Is it a good idea to paint the reflector Matte black (Black 3.0 paint) ? This should ideally remove/minimize the visible light before they hit ZWB2 filter and might be more effective than ZWB2 alone considering the limiting wavelength roll off in ZWB2 (will possibly make the roll off from ZWB2 on right end much steeper by cutting of any visible light ZWB2 is incapable of filtering). Or do you feel a black matte reflector will be redundant with almost no visible benefits when already using ZWB2 ? I feel i should try it out considering this wont cost more than a dollar. It wont hurt the UV (365nm) purity at least i guess provided the black paint doesn’t have any fluorescence ingredient.

Also curious, is there any variation in the quality of ZWB2 filter based on the manufacturer?

PS: I just encountered a post made by guy named Cadmium who has already tried this experiment before and he concluded that the light with Black reflector shows the same floody beam when compared with one without the reflector (mule) !!!! [https://www.ultravioletphotography.com/content/index.php?/topic/3510-paint-torch-reflector-black/](https://www.ultravioletphotography.com/content/index.php?/topic/3510-paint-torch-reflector-black/)

His results have reinforced my belief that what we see as the hotspot in regular UV light (with reflector) is just the most adulterated concentrated form of visible light + UV light in the entire beam. Ideally there should be a hotspot formed by UVA too (reason why C8 host – UV light exist for better throw) but that shouldn’t be visible unless shined upon a UV sensitive plate or panned across a UV sensitive material. Also the reflector should be optimized/designed for that UV nm range since UV light would focus differently than visible light.

Pic Credit : Cadmium

by Asleep_Solid760