I am trying to fix a UltraFire WF-1000L for a friend.
It runs of 2*18650 i.e. 8.4v using (I think) a linear driver and use MC-E LED.
The LED is burnt but I think the driver is working.
What LED can I use instead of the original MC-E (I measured 8.4v on the LED so I am not sure if a 6v XHP is suitable)
Replacing both the LED and driver is also an option, but what driver + LED combination can work with 8.4V input voltage?
If it is a linear driver the exact voltage won’t matter as excess voltage will be converted into heat at the driver, any 6V LED will work. I think you are getting 8.4V because the resistance is too much at the multimeter so the driver opens to the maximum to attempt reaching the target current.
I am not sure it is linear.
Not with that inductor in there…
Do you know what kind of driver is it? Want is the output voltage?
Not in the slightest, only that it’s not linear, but switching.
Some better pictures of the driver.
Hope it is easier to identify it
Ooh, big honkin’ FET and big honkin’ inductor!
High current, so almost sure it’s a buck converter for a 3V LED. I’m assuming all pins on each side of the MC-E are bridged together?
make sure the mosfet isnt shorted.
something killed the original led.
you need to find the cause.
You are right, just replaced it with XML2 and it works fine.
Thanks, measuring vin on the LED open circuit confused me.
These UltraFire lights a so shitty, that so many things can cause the LED to fry :) I am suspect that the LED minus wire was touching the pill, I fixed this and hope problem solved.
I also used a larger star to improve cooling, the original was tiny and barly had contact with the pill
i know what you mean.
those things can be decent originals or counterfeit clones of clones.
some they cant even spell!
like uitrofite or ultraflrc.