Led4power.com : LD-4 CC linear drivers, ILC-0/1 illuminated tailcaps, optics, MOSX, copper DTP MCPCBs...

oh yeah I must read it through thank you! Btw what do you think is suitable max amps for a triple s2+? What would be best ? how far can you push it? I know it gets hot and should only use high amps in short bursts but what do you think?

9-12Amps total is what most people use for high power builds, driver should be B4 variant in combination with mosled or mosx metal core PCB.

Just for information and maybe a suggestion, have you thought about making a triple mosled board for the E21A? These leds seem like a perfect fit for LD-B4, they have a very low Vf, work well with optics, are avaiable in very interesting tints and are best driven at ~2A, which would make for 6A total max current which I find ideal for small triples. I know Clemence is already making some boards but I would prefer the more traditional/well known triple layout and I don’t think I’m the only one, though I don’t really know how much of a market there would be for something like that.

By the way, I’ve been using my triple X6 with LD-A4 and the LD-B4 E2L a lot lately and I’m really enjoying the amount of configuration options and the ease of use of the configuration menu, after memorizing the menu it becomes really easy to customize the driver on the spot depending on my needs.

+1

Are those nichias compatible with carclo optics? They are very thin and domeless, I'm not sure they would work well with standard optics.

They are compatible for sure as there are official numbers for cd/lm and efficiency on the carclo website ( example ), and they seem more or less in line with the usual 3.45mm domed leds though efficiency looks a bit worse.

I’d guess that the focus would be a bit off, the optic should be a bit closer to the board. A bit of filing of the legs to extend the narrow bit should solve that but it does complicate the mod.
Apart from that, the attractiveness of such a board is a bit dependent on those nice offerings from Clemence, I hope that he is able to keep getting those nice leds.

That said, a triple E21A board sounds pretty cool to me. :slight_smile:

I use those too, but i pushed a square diamond coated file through it, so you have 4 corners filed away.
Perfect fit.

Received my MosX mcpcb’s today , that was fast !

Just tried 2 of them , with 2 Oslon black flat leds (LUW HWQP) .

The reflow was really easy , pads line up exactly and you can remove excess solder easily .

I made a simple setup in a Eagle Eye X6 , with a fet driver using a PSMN3R0-30YLDX fet (not really low resistance fet) . Soldering the wires on the mcpcb is tricky , thank god i have a soldering station with variable temp .

Unfortunately the light it emmits turns blue in turbo (when in direct drive) , so i guess as djozz mentioned the thermal pad of the Oslon isn’t big enough , and the black flat can’t handle the heat on a non dtp board .

I will run some more test tomorrow and report back.

I haven't tested black flat yet, but conclusion is that LEDs with very small die and small heat pad area really need copper DTP. Efficiency of LEDs drops at higher current because of two things: temperature of die, and current itself(why, still not fully explained by physicists) . For most big LEDs second cause is dominant at high currents because lumen stops increasing even if die temperature isn't even close to 150C, which is maximum allowed by most manufacturers. Maybe best example is Luxeon V with industry lowest thermal resistance per mm2 of die (0.8C/W,4mm2), it tops at around 9A, but if you calculate die temperature at 9A (LED on CuDTP, room temp. 20C), it is only 20C+ 9A*3.55V*0.8C/W=45.5C , not even warm in LED world. So second cause is dominant. This means even if you put such LED on non-dtp board which would cause for ex. 10C higher die temperature, that's still only 55C, difference in light output would be hard to detect.

On the other side it seems temperature effect on black flat is considerable, simply because power density for tiny 1mm2 die is very high. Temperature of die with copper DTP at room temperature,5A is 20C+5A*3.9V*4.3C/W=104C , this is quite high, if you take fact that typ. flashlight would have 40-50C temp., then die temp of oslon is very close to max. 150C. That's why every additional deg C caused by non-dtp board would have visible impact. Problem with black flat is small heat pad (3.5mm2, but it's questionable how good is heat distributed over that 3.5mm2 inside package), if black flat is in XM-L sized package, difference between DTP vs mosX would be much smaller.

As I said earlier, I designed mosX Osram/luxeonIR boards for infrared LEDs, where power density (~ max 2A) is much lower than with black flat, I expect no visible difference DTP vs. mosX in that case.

EDIT: When soldering wires to mosX boards, best method is to put some solder on iron tip and try to put some solder on one of the big pads. At first nothing will happen, but as board heats up, solder will melt over pad when board reaches high temperature. So it's important to hold tip on pad steady for some time. After board is hot, sodlering wires on all pads is easier. Board must be on piece of thick paper or some other thermal insulator.

Thanks for your detailed explanation :slight_smile:

Black Flats often turn blue at 5A, even on DTP PCBs. Limiting the current to 4.5A fixes the problem. The brightness difference is negligible.

The quality of the soldering will also have an effect on the performance.

That’s a great idea :+1:

Have been looking at these drivers a bit lately. Very interesting, with a lot of features I like.
Couple questions I haven’t seen yet………

When the double tap high (100%) is turned on, will it still be a part of the normal modes?
Ex= if 4 mode is set, normal mode changes go 2-10-30, then back to 2, with max only on double tap?

Does anybody know if the quad Luveon V will fit under the Astrolux S41 optics?

Thanks,
Jim

I think that version has not been reported yet. It does fit under the quad Carclo, but the S41 optic is a bit different.

Thanks Djozz, I will have to check on the Carlco quad.

I have their triples, but not a quad to check if I could make it fit. If I recall correctly the S41 optic is only 22mm, where the Carlco is 24.
May be possible to shave it down a bit, 2mm is not much. Pics on MTN looks like I MIGHT be able to just get away with it.

Double tap is just shortcut, so if you have 4 modes and 2x tap to high enabled, modes will work 1-2-3-4 just as usual, 2x tap mode jumps to mode 4 from any other mode.

About S41 optics, if it's different than carclo then it would not fit. I have several more mosX boards on my wish list, I could add S41 to that list too, and make them in next batch, but I need detailed drawing of such board.

Unrelated to this, I have soldered Luxeon V LEDs on mosX 4040,3xV,4xV with soldered LED wires ready to use, I just need to list them on my page.

Coupon codes for larger orders:

L4P-3of50 3€ for every order over 50€

L4P-10of100 10€ for every order over 100€

L4P-25of200 25€ for every order over 200€

L4P-45of300 45€ for every order over 300€

@ led4power
Any idea when you will have the Luxeon V on 16mm DTP mcpcb back in stock?

~3weeks.