Good efficient 6v driver?

Flashlight Modding and DIY Parts
1

I am looking to assemble a drop in that can use an 18650, or 2x CR123, while also being efficient.

I believe the KD 7135 driver will do it, but burn off the extra voltage as heat.

Is there a better driver that isn’t too expensive?

2

Have you found a good solution?

3

Funny, I just tested some yetserday.

I got an SD-12 1 amp from KD as well as an East –60 that HKJ tested.

They appear identical in performance. Layout is the same. The east 60 is rated at 4.2 volts, but when i had two CR123’s connected it worked fine. Lower output, but better efficiency comapred to 4.2v input.

Output plummets below 3.7 volts, so matching them with a high voltage battery like Samsung or LG gives a pretty decent run time i think. I’ll be playing some more today with my East 60

4

They look the same but the voltage in description is a lot different
east driver: http://www.fasttech.com/products/1114501

http://www.kaidomain.com/product/details.S008847

KD says:
Input voltage: 3.0~12.0V

- output current: 1.0A maximum

- Mode: Single

  • Dia.: about 17mm

So what about 7-8V is the sd-12 and east60 capable of that? Could you please test it?

5

Just tested the fastech driver with 6V and it seems to work, just tested a minute with 7V.
I also slightly resistormodded it with a 10ohm pot to deliver 5W.

6

I have used 2xCR123 with plain Nanjg 105Cs plenty of times and never had any issues. After the initial sag I don't think there's a whole lot of excess voltage to be burned off anyway.

7

I believe that.
HKJ has tested a cr123, they don’t have 3V under load…

I have ordered this because a friend came and said: you can do all this LED stuff please use this ikea mr16 led bulb and build it in my lead acid lantern which uses flashlight bulbs :quest:
It has a charging plug and a lead acid battery, so over 7V when charged this would fry every standard driver, a nanjg with a Zener or without controller may work but it is inefficient.

So I ordered this driver to drive the bulb LEDs, but I managed to get the original 12V driver used, it was a nice regulated one which started regulation at 7V, I bypassed the rectifier and voila…easy one.

This is now spare, just tested, modded and wrote the specs on it.