Flashlight concept #2 - the ideal Luminus SBT-90 Gen. II light

I hadn’t seen the new acebeam k30gt yet either. My take: though I like the size and 3x cell layout, there are not enough cooling fins, and no 21700 support. It s very similar in head size and length to my catapult v6 which I really like for a jacket pocket light, and the bigger handle of the acebeam should fit the hand better.

.25 lux on an object is not bright enough for me at longer longer distances,since I live and work on a large ranch with both livestock, predators, and big game, so putting lots of lux on an object while far away is paramount…so my acebeam k75 is nice- I use it all the time. It just doesn’t handle the heat well enough, and though it is not that heavy, it is a little bit unwieldy. I’ve often thought that a vertical handle, and more effective cooling fins would make this light better.

Lux, your concept intrigues me. Nobody can seem to get it right with this led. What if you could buy different sized heads to fit on the same handle? Led and driver stay with the handle. Heat transfer would be an issue, but is there a way to make heat transfer to the head better?

My idea:
A configurable body. A lightweight, highly finned head housing a 4 1/2 inch reflector that can either be screwed to a battery handle just like our flashlights, or a separate battery pack on the belt, or a battery pack below a very ergonomic handle similar to modern cordless drills. Hmm, stuff to think about. I can do cad design, and could always 3d print plastic handles and such for prototyping, but dont have machining access anymore.

Doing what?

So, a courui d01 with 21700 in place of 18650 and added features…

3 40T's would be interesting for this LED for sure - great power, decent capacity. Expect 30+ amps draw I suppose?

The MT07 is a beast, though a little big/heavy for me, but a reduced diameter battery holder with 3 21700's would be an advantage.

PearlRiver - what exactly is HL doing?

Looks like a nice light. I’m sure it will do over the stated 260kcd.
I’m talking about something a bit more compact though. IMO it’s a bit heavy for pocket carry. I have an NI40 coming but would prefer a 21700 side switch anduril light which is a bit shorter and lighter.

I'll 2nd that! I find the easier I can carry a light in my pocket, the more use it gets.

I say, the BLF GT4 host with single GT reflector and SBT90.2 :smiley:

The best flashlight is the one that you always have with you. ;-) I fully agree with you except for one thing. I have some doubts that SBT90.2 is an emitter that fits well into a pocket- / EDC- flashlight. I see following challenges here but please feel free to correct me:

Price/Size ratio:

Usually, EDC lights have a quite sensitive pricing level. With a $ 35.00 LED inside the price is likely to reach "premium" areas.

Size/Heat ratio:

SBT90.2 is a monster in terms of excess heat, being driven up to more than 20A. The smaller the flashlight gets, the more difficult it will be to transfer and dissipate the large amounts of heat. Unless driven at lower currents with more efficiency, maybe other LEDs would suit better?

LED/Reflector Size ratio:

With its die size, footprint and domeless layout the SBT90.2 seems to be best for throwers. Since these specs would collide with a small sized reflector, there might be alternative, cheaper but also brandnew LEDs like SST-70 or XM-L3 more appropriate? However, maybe with the right TIR lens the lack of a large diameter-reflector could be compensated somehow.

Lux_perpetua is Haikelite?? Or it look more alike ? Nevermind…

Have anyone try put this sbt90.2 to convoy L2? Does is fit? Just for a try with convoy driver…who know it will be much so low heat? Idk.

I’m just curious how the 20+ amp passing and where the heat will dissipated. I think most about current flow should be regulated constantly with rise with temperature. Or is there any better regulator out there for sbt90.2?

Not even remotely.... He's also not working for any flashlight maker.

He's just another guy who is enthusiastic about these tiny little devices we all call `flashlights`. Call me nitpicking or whatever but mostly I've got something to rant about a new model. Sometimes it's the UI, sometimes the chosen emitter, more often it's the thermal regulation and sometimes it's just details in the design that I cannot fully agree upon. With so many great minds here on BLF I started to ask myself the very question if we could put our minds together, develop some nice concepts and see if we can encourage one or more manufacturers to follow our ideas. Rest assured, some flashlight manufacturers will surely have a look onto BLF's "think tank" even without being actively involved. :-)

I see a few mentions in this thread but 3S and buck driver do not equal 12V

K30 gt price is JAW-DROPPING Does making higher price solved the problem? Bluffing.

Well, yes and no. I was only referring to three cells in series (3x 4.2V = 12.6V) but the buckdriver will convert it accordingly.

It still doesn’t make sense. You can do a 9V LED with 3S but not a 12V and if you are going to use buck for anything less than 9V why would you choose 3S? You need 4S for 12V out

Sorry, I think we misunderstand each other completely right now. I never meant to talk about a 12V LED. Instead I was talking about a 3V LED that requires a buckdriver to convert the voltage of 12V (3x 21700 in series) down to the 3V LED voltage. I hope it makes sense now. Sorry for the confusion.

If that’s the case (which seems pretty slim chance of happening) you should do 3s2p 18650 and make a long tube where you can choose to put 2, 4, or 6 batteries in and scrap the idea of charging.

Even better since we are dreaming make a buck-boost driver and have either two tubes or an extension tube so people can do 3p or 3s2p or anything in between!

Wow first time I’ve heard of this new light. I was going to say I prefer a more compact 3x18650 since 3x21700 is about the same diameter as 4x18650. I also like the SP70 and L6 form factor. Maybe even a 32650 battery host would be one of a kind. I would love to have a long base ball bat like flashlight for self defense.

Realistically all true, but I don't really care - it's for me, not the general public . My problem would be fitting the 20 mm MCPCB in a small head, and getting the reflector hole to fit around this huge LED. There are XHP70 tactical lights around, little bigger maybe than pocket carry, but similar argument could be made against those but they do tend to have boost drivers that limits the amps considerably, least considerably from what we typically do with a FET driven XHP70.

I'd probably go with a larger pocket carry light like the Lumintop SD26 - takes a 26650, has a great small SMO throw reflector, etc. Vinh used to rave bout this light and for good reason. I got one all modded up runnning NarsilM - outstanding quality and performance. Shame it's apparently dropped now - great light, should have done better and been rev'd up. The craze of TIR optic multi-LED lights kind of killed it. Here's the page on it: http://www.lumintop.com/sd26.html, broken links to buy one.

Any progress? Do You think the newest ft03 sbt90,2 will be better?

I've been working on the SBT90.2 in a 1504 pill and a B158 pill. Got the MCPCB fitted in both, with clearance for 22 AWG wires.

The brass 1504 pill was designed for a 16 mm MCPCB so had to dremel out a shelf or lip to widen it out - took a lot of hand work, least for me, but think I got a fairly even surface now, widen to about 19.4 mm or so. Still need to sand down the MCPCB to fit, and it does, barely. The 22 mm wires are a tight fit right now - think'n of widening out the LED wire holes even further. Clearances between the solder pads and the brass pill wall is really close - would be risky/difficult to get 20 AWG wires in there. The plastic retainer/centering piece can't be used anymore - the threads have been completely eliminated for it, so will have to drill and tap out holes for 2 screws to hold the MCPCB down. Other option would be thermal grease/thermal epoxy combo - something I've done before, but think the screws is a better approach and I've done a lot of those too.

For drivers, right now plan on using an existing SIR800DP 17 mm, 4 mode driver I already have in the 1504. For the B158, the B158 pill I modded with the SBT90.2 takes an odd size driver of ~18 mm, so need to adapt a 20 mm to fit.

These things never go easy and haven't had much time lately to give it the hours needed.