rgbw star is different, the one i responed to was not rgbw star, was it?
So you are saying that cutting the traces on a XML MCPCB something like this (I’m horrible at drawing with a mouse) because of the thermal slug encroaching is impossible? Please explain.
Do the Carlco optics block UV? I think a UV-triple Convoy-S2 would be a good hunting light if the UV isn't blocked. I'm considering options to make a simple reflector-based triple, but I'm not aware of any suitably budget-priced host options.
Unfortunately the block all uv. They are made of polycarbonate
- well I’m not sure they all are -if any are made from glass, they do not block uv
I think that plastic flashlight lenses and optics may be made of polycarbonate (PC) or polymethylmetacrylaat (PMMA). A quick search gave conflicting transmission curves for PC, the first one shown is wrong between 300 and 400 nm and seems to have swapped PMMA and PC (it is an advert for a substance called zeonex, so don't trust that stuff!), the rest mostly agree:
But how's that in a flashlight situation? I positioned three flashlight optics in front of a white piece of copier paper and directed a single colour flashlight to them from 50cm distance so that a shadow was cast on the paper. The UV flashlights cause blue fluorescence on the paper so that it shows visible. left=standard plastic aspheric lens (PMMA or PC?), right=glass aspheric lens, bottom=Carclo optic (PC).
First in 532nm:
good transmittance for all three
Then 400nm:
the plastic optics seem to absorb some of the light, but you get away with plastic
And 365nm:
so don't use plastic for 365nm, glass is fine.
Wow! Thanks djozz! I know I won't waste my time trying to make a TIR-based UV light now...
Nice and understandable explained!
yea, that is what i was thinking, the heatpad will short the contacs, but looking more at your pic. it does seem like it can be done, after all. at least in thoeory, my bad, seems like i was wrong here.
yes, i noticed the problem a while ago, i got good results with PETG instead of polycarbonate, also some scratch resistant coats block uv as well.
also acrilic lets uv thru, but it is too britle, imo. cracks easy. not something i use in my buids, but it can be.
however i have not tested neither petg nor acrilic on how they do\don’t let thru 365nm. the lowest wavelenght i tried was about 375-380nm.
Wuhuuu!
Just received my Solarforce L2N host, with a uv-LED 365nm LedEngin p60 drop-in. Happy happy! Though I’m actually more excited about the taped up Ultraforce C8 with a 400nm LED soon to be received from djozz :-p
…
Seems to be an error in the LED - but not noticeable when looking at the hotspot on a wall. (click for large image)
Edit:
Actually it is visible … Will send a mail to http://www.customlites.com/ 
Wow, that is a serious fault in that led, and clearly visible, they should not have sold you that. For the rest: great purchase!
Yeah … I just mailed Dave from customlites to hear what he says.
I’m quite surprised by the amount of visible light this LedEngin LZ1 emits. Will field test it sometime in the coming week. Depends on the weather.
I am still considering if I should buy a UV pass-through filter as Robert suggested earlier. But that depends on what the field test shows.
I really wondering if LEDENGIN is having some serious quality control issues. I had to RMA the first one that I bought because the die was shifted up in the 1 o’clock posistion under the lens. And now this one with a bad spot on the die. For the amount that they charge for them, they should be perfect.
“as unexploded mines from WW2 from time to time appears”, F%*& the flashlight what you need is a “land mine detector”!
+1!
Already got that. It’s called feet … :-p
I don’t think any of them ever exploded in my time (I’m 34 years old Edit: I’m 39 … must be the dementia that starts to kick in … ) Most of them are really rusty. I think it would take a Tank to set them of - if they even still contain intact explosives :-p
Not taken by me, but from the area (click to see the full album):
My ol’ man is “strandfoged” (wreck master?). He takes care of things that wash ashore at the beach. Some 20-25 years ago it wasn’t uncommon that we had 5-10 mines laying around at the back of the house. Which he transported home at the back of his truck. bumpety-bump bumpety-bump :Sp
When the wreck masters along the western coast of Jutland had collected enough mines, the “Explosive Ordnance Disposal” guys would come. They would be extremely careful handling the mines.
They would take them back to the beach, dig a hole, and place the mines in layers alternating between mines and c4. And with a safety distance of 500 meters - BOOM!!! I saw it once when I was approx 10-12 years. Made a big impression.
Btw -my dad still got all limbs … 
Sorry bout’ the off topic. Just a flashback because of the talk of mines
I love finding shark’s teeth, but have only looked for them during the day.
Are you able to find them at night with a UV light? What UV light is good for finding them?
None at all, they are just the most interesting things I find. I've only found them in the day time too... I've spent several hours hunting at night using several different flashlights with different configurations (WW, CW, zoomie) bit never found a single tooth.
carclo does use polycarbonate, but ledil uses pmma. they even make special tir for 365nm leds. especially for ledengin lz1 FCN12592_LE1-D-COP
http://www.mouser.com/ProductDetail/Ledil/FCN12592_LE1-D-COP/?qs=FBI%252bX3tnPf2hWZ05RwIuAw%3D%3D
http://www.ledengin.com/products/lenses#LZ1
Great info alpg88. Thanks!
Got the 400nm uv flashlight from djozz yesterday.
THANKS!!! 
Even though the weather condition was nowhere near amber-licious, I had to go out and test the light.
The first hour i wore glasses with yellow tint, and didn’t find diddlysquat. I then changed to the clear lens. And that helped a lot. Found 10-12 small pieces even though there was to much moonlight, not the right wind, not the right current, and no mermaids …
Sorry about the sniffling - It’s fracking cold at the beach tonight
Hard to tell from the video, but it works really well. Could wish for some more power, and a bit wider hotspot. But all in all GREAT!
When 400nm works this well, I’m looking forward to field-testing the 365nm. Going to take some time though.
Had to send my 365nm LedEngin p60 drop-in back to customlites.com today, as the Led had a nasty dark spot. Kudos, thumbs-up, allahu akbar, and hallelujah to Dave from Customlites, for replacing it with no hassle
The power can only be helped with more LEDs, but for a wider hot spot you can try matte scotch tape. You know, the “invisible” kind that isn’t shiny:
Apply it directly to the flashlight lens. This will diffuse the beam, the more of the lens is covered the more diffuse it gets. If you don’t like it, just pull it off again.