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

There are many lights that come stock with 7070 LED or get modded with one, so I don’t agree it’s not really practical. Nevertheless I agree that it would be better with a smaller package. But it is what it is. And it is the most powerful 3V LED under $100.
Not a great choice for throwers, but a good flooder LED.

Luxeon MX is basically XP-50(2) in XHP-70(2) package, max. lumens would be ~4000lm when overdriven, most people would find this to low, when they can get 2 times more from XHP-70(2).

Do somebody knows a flashlight host, which is suitable for MOSLED 4XP quad d=20mm , LD-B4 and any of the compatible circular edge Carclo optics together?

I am thinking about to build a flashlight with these components, as they seem to be very tempting, but I would need some additional preparation and help. Thank you in advance for any helpful input :slight_smile:

I built a Convoy M2 quad with those parts and kiriba-ru’s spacer. I like it a lot. Also added one of the lighted switches.

Convoy M2+kiriba-ru’s spacer will be very nice.

Take a look at #65

Thank you very much. That would seem to be a nice host for it. I was just wondering, and now I just take note, but I will schedule that build at some point :slight_smile:

Samsung reel of 351D 4000K 90CRI is coming next week.

Dear Neven,

Is there any chance to get your LD4 driver with e-switch firmware in the near future? I am highly interested to use it in the new Sofirn C8F since this one is only available with tailclicky and side switch. Meanwhile the one without side switch is hard or impossible to get.

Cheers,
Thomas

I'm finally close to an end of designing other stuff (mostly pcbs, large batch of various designs is coming within 2-3 weeks ), which took a lot of time and money, so drivers upgrade is one of the next things on to-do list (I left them last because they require a lot of time for developing).

I think it needs to be 31mm to fit X6 .

They will be 31.4mm in diameter, so they should fit X6, there is small possibility they will not fit on some hosts because of production tolerances, but in that case there is maybe ~0.1mm material to sand down, and that should be very easy because PCBs have 5.5mm central holes, so you can use battery drill in combination with M5 screw+some washers to quickly sand it down.

Awesome , thanks !

Added couple IR LEDs: new 4715AS-EA (upgraded AS), Luxeon IR 850nm 90deg and 150deg variants, all on 20mm mosX board:

https://led4power.com/product-category/leds/infrared/https://led4power.com/product-category/leds/infrared/

Hows does the efficiency of the 1S LD-A4 driver compare to a common 7135 driver?

LD-A4 doesn't use PWM, so overall light efficiency is higher at lower currents.

On high mode driver efficiency is theoretically the same: Eff=Vled/Vbatt.

Average LD-A4/B4 efficiency (from full to empty battery) is around 85-90% for most LEDs.

Did you ever explain anywhere how it actually works? How do you use a FET to make a linear driver?

Variable linear regulator.

A FET can work as a variable linear regulator.

More expensive, but allows for higher efficiency since it is not using PWM.

That's probably ~100years (almost) old technology, FET works in linear mode (hence the name linear regulator) as variable resistor (from few MegaOhms to few miliOhms), analog electronics+ uC controls FET so that output current remains constant.

In theory it's simple, in practice not so much if you want wide output current range (from mA to 10-20A),low internal resistance,small size etc.

led4power, I so wish I could have Andruil with your driver….

That would be quite difficult to do, ad the LD A4 and B4 does not support e-switches if I remember well.