Osram red in the C8+ is good, but really enjoy the wider beam + 600m in the L21B
I’m going to tell Simon to hold off and test the XP-E2 first
Which nm version was that XP-E2? Any idea if all 3 620, 660, 730nm would take 3 amps?
I think that I talked about how much overvoltage the 7135 chips can take, it was not about leds. Or is ghe quote from another of my posts?
Anyway, none of the red XP-E2’s can handle 3A. Apart from that they max out at just above 2A, the red led types are much more sensitive to warming up than blue leds, so even at 2A you can see the output lowering after a while.
But there are 660nm leds that can handle 3A, i.e. the 660nm XP-G3, a pretty cool led with a bit larger die than XP-E2. I bought it from Mouser and tested it 2 years ago but never made a proper thread about it. I did post some test results on BLF buried in another thread, and it can be found via via signature link. But here it is: [Postponed] Sofirn SP10R - deep red AA/14500 EDC - #55 by djozz
And then there is the Luminus SST-20-DR 660nm, I don’t think anyone has bought or tested one but it also has a larger die than XP-E2 so should handle 3A.
I have the SST20 DR (gen 1 I believe) collecting dust in my stash. I need to check my mouser invoice to see for sure, but I know I bought samples of each dome version/emission angle and plan to output test and also check cd through a reflector and b158 aspheric
I am interested in a floody, red light soda can. Any suggestions to mod or purchase? I have an sp36 I wouldn’t mind using.
Got around to part of this this morning. More later. Turns out I had a 90deg SST10 DR and 120deg SST20 DR. Output tested the SST10 and threw it in the B158 with a Convoy 1.5A buck driver bumped up to ~1.9A (stock only pushed 1.35A, efficiency is bad as the input current was basically the same with Vin nearly double Vf, I’d ballpark it around 65% (sigh)… Tail amps are reading 1.81 right now with the aged 25R at 4.06V. Beam is okay, actually pretty round.
Output tested the SST10, won’t post full results yet…When I do it’ll just be relative output because lumen figures are almost certainly meaningless with my setup for non-white emitters.
Point here is that Luminus rates these aggressively. 1.5A gave 90% of peak output - which occurred somewhere between 2.1 and 2.3A, depending on temperature. Bond wires survived an accidental hit of 3.14A, so good news there. I’d say running these at 1.5-1.9A is an appropriate top end, depending on how much of a number pusher you are. Might dial the driver back down with an r120 (r150+r330 now) and target ~1.7A which is 96% of max flux.4
TLDR: Luminus datasheet is BLF-approved. Spec Imax yields 90% of the ultimate potential. Bond wires are robust and can survive 2x rating. Personal recommendation of 1.5-1.7A for turbo.
Thanks for the results. Yes, relative output is the way to go, with almost all luxmeters you get big errors at the flanks of the visible spectrum.
So real world, naked eyeball testing last night suggested the throw range is 350-400m ‘unaided’, and up to ~600m in ideal conditions looking through an optic. Targets where grass, soil, and trees. I’m sure reflective objects could be seen out much further, but I don’t think many people hunt road signs.
A tree line at 345m was very clearly lit up, and I could pick out individual trees. At ~600m, there was a weathered wood telephone pole that I could barely notice being illuminated. In fact, before scanning the area with a 350kcd white light, I didn’t even know it was there. Spot is fairly large, with a full angle of about 2.7º - just about identical to the WT90.