FW3A, a TLF/BLF EDC flashlight - SST-20 available, coupon codes public

Can’t answer these, but may I suggest to consider - at least on a “trial” comparison - the Luxeon V ?

Thanks for the efforts on this!! :+1:

● it does exist, the datasheet says 90CRI goes up to 6000K, and there is a 5000K 90CRI one at Digikey: https://www.digikey.com/product-detail/en/samsung-semiconductor-inc/SPHWHTL3DA0GF4RTR6/1510-2334-1-ND/8568350

● I only have them behind a 10507 optic and that looks good: big smooth hotspot (1.5 times the size of 219B in that same optic), despite the large die no weird squares like XP-L Hi.

● no idea, the die and dome are quite large so the optic may not be as efficient as with small leds, and the light is very spread out.

The triple 10507 optic light (Jaxman E2L) with 4000K 90 CRI LH351D on an Aspire 18350 cell does 1800 lumen, on a 18650 cell a bit more, but you loose a bit again with the frosted optic.

In general in your table the outputs are optimistic, in a small light like the FW3A you only get such numbers in the first second, maybe.

I’m really not sure how many lumens to expect from a high-CRI LH351D triple, compared to other options.

I would like to purchase one of these. Please add me onto the list.

The list will be updated later
I’m sorry, now I’m with the smarphone (Mobile phone),
and I need the PC

I expect 4000+ lm with LH351D CRI70 5000k, 3400+ lm with LH351D CRI90 5000k in a clear optic. 12A current draw. For 10511 CRI90 prediction drops to 3300+, CRI70 stays.
Warmer tints are less efficient. These numbers are rather conservative, mostly because current draw should be higher.
1.5 cd/lm with 10511 and 2 with 10507? That’s very imprecise.

If LH351D was to get dedomed, I’d say:

  • CRI70 5000k 10507 3300+lm, 3.5 cd/lm
  • CRI70 5000k 10511 3300+lm, 2.5 cd/lm
  • CRI90 5000k 10507 2800+lm, 3.5 cd/lm
  • CRI90 5000k 10511 2800+lm, 2.5 cd/lm

I have a triple samsung 4000k in a Convoy S2 mod. They are very nice and give a huge hot spot. I have to get which optic and specific emitter are being used. Not as pink as an XP-L Hi. Would find these to be an awesome choice for this light! Extremely smooth beam and minimal weird outer distortion.

I’ll take one

Guys, it’s way to early to actually produce this light. It was predicted for 2018. To have it produced before 2019 would be to shatter reality as we know it.

Hmmm…. Why do you say or think that??

I'd like one depending on the final price. Thank you for your good hard work!

I’m liking the look of the Samsung LEDs just because they won’t run as hot as 219Cs and kill themselves.
I also like flood. :+1:

I think the LH351D might be an awesome choice, actually. While those who want throw out of a small light might be disappointed, it doesn't seem to have the issues that the 219c and xpl hi have - The 219c would be pushed to run hotter and has less output, while the xpl hi would have low color quality and raise the price, with the maximum lumens perhaps 1/4 more than the 219c. The xp-g2 and xp-g3 have their own issues; the xp-g2 has the lowest output and the same low cri, and the xpg3 has poor beam consistency as far as tint goes although it gains more output in exchange for more heat. The LH351D however seems to be possessed of only one main trait that might not appeal to people, which is that it has a wide, smooth hotspot and not a tighter beam. I think that's fine personally; I will not be using this as any sort of thrower.

Maukka is very impressed by the LH351D's color quality in his /r/flashlight post on reddit "Samsung LH351D is a winner" especially on higher outputs. It is not plagued by tint shift across the beam, but it does rise above the BBL at low current (1x7135 or less, essentially) about as much as a 219c does. Its output is seemingly identical to the xp-g3's, and is much closer to the xpl hi than to the 219c. Should be about 9/10 as bright as the xpl on turbo; I doubt I could tell the output difference reliably. It'll be a nice floody beam with good color quality though. Maukka says that when using a mild minus green filter that lowered the color below the BBL, it took on a very nice quality of light comparable to a 219b sw40k, though of course with higher output.

I’d be excited to see a production light use the LH351D, but then I’m always good with 219Cs.


Just to give an idea how much better the LH351D is compared to an XP-G3 in a clear TIR with regard to tint shift.

Nude Gnus is Good Gnus?

and Kapton tape in lieu of spacers

Kapton-insulated electrical wiring has been widely used in civil and military aircraft because it is lighter than other insulators and has good insulating and temperature characteristics. However, Kapton insulation ages poorly: an FAA study shows degradation in under 100 hours in a hot, humid environment, or in the presence of seawater. It was found to have very poor resistance to mechanical wear, mainly abrasion within cable harnesses due to aircraft movement. Many aircraft models have had to undergo extensive rewiring modifications—sometimes completely replacing all the Kapton-insulated wiring—because of short circuits caused by the faulty insulation. Kapton-wire degradation and chafing due to vibration and heat has been implicated in multiple crashes of both fixed wing and rotary wing aircraft, with loss of life.

The descent stage of the Apollo Lunar Module, and the bottom of the ascent stage surrounding the ascent engine, were covered in blankets of aluminized Kapton foil to provide thermal insulation. During the return journey from the Moon, Apollo 11 astronaut Neil Armstrong commented that during the launch of the Lunar Module ascent stage, he could see “Kapton and other parts on the LM staging scattering all around the area for great distances.” [7]
According to a NASA internal report, space shuttle “wires were coated with an insulator known as Kapton that tended to break down over time, causing short circuits and, potentially, fires.

well done, thats what prototypes are for

knurling in the waistline would feel legendary… :wink:

I like the second one better, smooth center reduced section looks clean.

+1… Agreed. :+1: The longer front taper looks better too IMO. YMMV…. :wink:

good cause thats the FW3A, this thread is about.

the top light is a Titanium HDS Ra Clicky that sold a couple of years ago for $650, over 15x the cost of the FW3A.

HDS uses CR123/16340 cells, that have about 1/5 the capacity of the 18350 in the FW3A, which is also over 15x brighter than the HDS Ra Clicky

as you can read below, the HDS and the FW3A are about the same size: