Emisar D3AA is available now

[80T]

@undefined

This has probably already been answered, but the thread is 169 pages long and I haven’t seen every single post yet… Does the boost driver support a lighted switch on the D4SV2?

If you specifically ask for it, yes. Likely it will be an actual checkbox option on the shop page soon enough.

I believe that has been answered just a few posts back..

[ToyKeeper]

@TitaniumDust

@Hank Wang

sm453 M450 R9080

sm353 M400 R9080

sm273 M350 R9080

sm573 M450 R9080

That’s a great selection! It might be interesting to get some of the `50e` bins as well and offer both as options. For example, sm5750e, sm4550e, sm3550e, and sm2750e. In theory those would be rosier on average - for people who like that. I personally like things more neutral, and it’s better for tint ramping lights, so I’m happy with that initial selection. However, the `50e` bins are likely really interesting to some as well, since it should make for a rosier emitter without the need to dedome.

Sounds like a good idea. The sm4050f and sm4550e in particular seem like desirable bins. Maybe even sm4050e, depending on how warm it looks.

Or a tint ramp between sm573 and sm273 should be good too.

[thefreeman]

According to Clemence those bins are not available unless you order very large quantities.

[Bob_McBob]

@thefreeman

According to Clemence those bins are not available unless you order very large quantities.

The yields are also very low since they’re picked from regular production. Basically you have to be an extremely good customer ordering a ton of LEDs before they’ll even consider the request. We’ve never had any success in past attempts to order the special chromaticity bins.

[tactical_grizzly]

I did direct comparison of Hank’s Linear+FET driver and the new Boost driver in two otherwise identical D4SV2’s. Here’s a runtime test with both set as close in brightness as I could get them. The boost driver definitely provides a sizeable increase in runtime. More brightness, runtime, and regulation testing in my full review.

[will34]

That’s actually very impressive! However I would not pair it with throwy emitters since it will limit the performance quite a bit.

And I’m surprised that the FET driver even at 3.4V can produce more output than the boost driver.

The Boost driver is very well regulated, except the emitters would not turn on at all when the cell was at 3V

Is this a known issue with this driver or was it your specific unit?

[tactical_grizzly]

@will34

That’s actually very impressive! However I would not pair it with throwy emitters since it will limit the performance quite a bit.

And I’m surprised that the FET driver even at 3.4V can produce more output than the boost driver.

The Boost driver is very well regulated, except the emitters would not turn on at all when the cell was at 3V

Is this a known issue with this driver or was it your specific unit?

I haven’t seen anyone else test these new drivers yet, so I don’t know. I do know that I also have a KR4 FC40 with a 12V boost driver and it does not exhibit this behavior. It works just fine at 3V.

[ToyKeeper]

@Bob_McBob

@thefreeman

According to Clemence those bins are not available unless you order very large quantities.

The yields are also very low since they’re picked from regular production. Basically you have to be an extremely good customer ordering a ton of LEDs before they’ll even consider the request. We’ve never had any success in past attempts to order the special chromaticity bins.

Hmm, that’s unfortunate. It still looks like an improvement over LH351D though.

I’m not sure it would be great in a D4 or KR4 because it’s a relatively floody LED and these lights are already quite floody… but it occurs to me that it would probably be awesome in the angled D4.

So I’m thinking about doing an angled D4 with tint ramping from 519A sm273 to sm573, and maybe an 18350 tube to make it a bit lighter and less off-center as a headlamp.

[starryalley]

Question about D4v2 boost driver. I know Hank says it’s not compatible with E21A and each LED will get 2A max with the boost driver. Can I specifically ask to build a D4v2 boost driver with E21A but I will modify the firmware to limit the current? For example I can limit the ramp to 75% so maybe each LED gets 1.5A or so. Just wanna know when Hank says it’s not compatible, is it simply because of current (2A is too much for some LEDs) or is there something else. Thanks.

[BlueSwordM]

It’s possible that the MCPCB is the limiting factor.

[ToyKeeper]

@starryalley

D4v2 boost driver … not compatible with E21A … {why?}

The driver isn’t the problem. E21A needs a completely different MCPCB.

Hank has parallel and serial MCPCBs for the common 3535 LED size, but E21A doesn’t fit. So he has to make an entire set of boards just for E21A, and currently only has the parallel version. Parallel doesn’t work with boost.

[starryalley]

@ToyKeeper

@starryalley

D4v2 boost driver … not compatible with E21A … {why?}

The driver isn’t the problem. E21A needs a completely different MCPCB.

Hank has parallel and serial MCPCBs for the common 3535 LED size, but E21A doesn’t fit. So he has to make an entire set of boards just for E21A, and currently only has the parallel version. Parallel doesn’t work with boost.

Thanks for the explanation!

[UVChemist]

Do you think it would be worth getting the D4V2 with the boost driver? I’m curious how it would compare to the D4SV2. I like both, but the pocketability of the D4V2 is so nice. I’m in between a Zebralight or a boost driver D4V2 for my next purchase.

[BlueSwordM]

Yes, totally.

It changes the game for the D4V2: you basically get a light that’s with an excellent UI, beautiful emitter choices, and efficiency that exceed similar Zebralight lights.

[stephenk]

@UVChemist

Do you think it would be worth getting the D4V2 with the boost driver? I’m curious how it would compare to the D4SV2. I like both, but the pocketability of the D4V2 is so nice. I’m in between a Zebralight or a boost driver D4V2 for my next purchase.

Looking at reviews it seems that the D4SV2 has approx 50% more sustained lumens than the D4V2, but difficult to fully compare due to differences in calibration and testing conditions. The increased efficiency for the boost driver should result in roughly similar sustained brightness in a boosted D4V2 to a non-boosted D4SV2. I still think it will be no better than an S2+ for sustained brightness though, as the S2+ has more thermal mass.

[Hank_Wang]

KR1 dark grey, and cyan colors are back in stock.

[ArtieT59]

@Hank Wang

KR1 dark grey, and cyan colors are back in stock.

thank you!!

[thefreeman]

@will34

That’s actually very impressive! However I would not pair it with throwy emitters since it will limit the performance quite a bit.

And I’m surprised that the FET driver even at 3.4V can produce more output than the boost driver.

Copy pasting my answer from reddit :

This is due to the culpm1’s very low Vf, one of the lowest if not the lowest of the small LED we use and is able to pull a lot of current even with a low cell, especially with 4 of them. I haven’t added yet it to my direct driver calculator but the Vf of 4xculpm1 roughly equivalent to 8x519A. Something like 3.3Vbatt hits the same current per led as the boost driver, which is what u/TacGriz has found.

The other extreme example would be the XP-L HI, having the highest Vf 4 of them only draw 13~14A max with a full cell, the FET driver should meet the boost driver current per LED around Vcell = 3.7~3.65V, so about 50% state of charge, after that the boost driver maintains a higher output.

[twisted_raven]

@UVChemist

Do you think it would be worth getting the D4V2 with the boost driver? I’m curious how it would compare to the D4SV2. I like both, but the pocketability of the D4V2 is so nice. I’m in between a Zebralight or a boost driver D4V2 for my next purchase.

It depends if you value really high short turbo output, or value higher sustained output and/or longer lower output run times.

[tactical_grizzly]

@twisted raven

@UVChemist

Do you think it would be worth getting the D4V2 with the boost driver? I’m curious how it would compare to the D4SV2. I like both, but the pocketability of the D4V2 is so nice. I’m in between a Zebralight or a boost driver D4V2 for my next purchase.

It depends if you value really high short turbo output, or value higher sustained output and/or longer lower output run times.

Moonlight is also a consideration. In my testing, the new Boost drivers end up with a moonlight around 0.8-0.9lm. Whereas the Linear drivers typically have a moonlight around 0.1lm. Moonlight is a big deal for me, so in an EDC I’ll be going with the Linear driver personally. The boost driver is very compelling though, and makes the decision difficult.