hello, absolute newbie here, I come from another forum and landed here.
I’d like to ‘make’ my own flashlight which only need to be on for 5 seconds max with an extra wide angle, natural light, and with many lumens.
So now I found some leds that may suits my needs on a mcpb 4 leds that are 519A and color temp ( I read that 519a nichia without reflector angle light is 120 degrees and that’s fine for me.)
on the convoylight wesite, they are sold to custom a flash light they sell as well.
When I look at the flash light the driver characteristics mentioned are :
Driver: 8A 12 groups ( which doesn’t mean anything to me) they don’t sell ( or I didn’t find) a driver with those characteristics.
Can I find something suitable ( and where ) ?
Later I’d like the same set up with 3 mcpb to be able to light 360°
Are the 4 LEDs in Series or Parallel?
8A = 8 amps or 8,000 milliamps
If the LEDs are in Parallel and the driver is a 3 volt driver each of the 4 LEDs would get 2amps each.
12 groups is the UI.
You can set the driver to use 1 of 12 different mode groups.
Since you want just a short burst of bright light you can set it to mode group 12 which is 100% only.
my guest would be in parallel didn’t think about a serie configuration.
the cell for the flashlight is 3.7 volt.
( I found the pcmb for the flashlight here [519A LED , high CRI R9080 - Convoy flashlight] it’s 4 leds module
it’s for the Convoy S21D 21700 flashlight - Convoy flashlight
Ok, that MCPCB is Parallel.
Are you planning to mount it to some sort of heat sink?
Any Convoy 3v drivers would work for that MCPCB/LED combo.
If you are mounting the MCPCB to a heat sink and are only going to run them for a few seconds you could use a driver that’s more Powerful than 8A.
With heatsinking each 519A can handle 5A.
If you want to use a Convoy driver, I’d recommend the 12A FET driver.
My buddy tested it and it was pumping out 18A in his test.
That would give you 4.5A per LED.
I don’t have a preference of supplier because I don’t know any of them.
I’ve looked at a chart 4.5A is fine ( 1088 lm on the paper )
I think I’ll have a try with this setup.
I may use aluminum parts taken from old computer and cut it the size I wanted ( smallest as possible ) but won’t use fan.It looks like a puzzle but I don’t have all the pieces !
You dont need driver at all for 5 secs turbo with 4 leds. Just use some low spec battery and thin wires ( bad contacts works as a resistor). Convoy drivers will do too.
Thank you for those infos, I already bought a driver like that I’ll know a little more about flashlight modding and as we say in french “who can do more can do less”
I wanted to thank everybody because you provided me a great help.
I’ve received my driver and leds
And plugged everything, it is working and haven’t burnt anything for now !!
I know that when the flashlight is getting hot there is a security that decrease the power of the led, but I I don’t understand how it is working.
Is there a sensor in the led driver, and do I have to but it nearby for this feature to work ?
Yes, the MCU on the driver has a temperature sensor built into it.
For it to work correctly, the driver should be mounted to the heatsink close to the LEDs.
But if you’re only running it for 5 seconds like you said, that’s not necessary.
Thank you for your quick answer.
I’ll make my first ‘prototype’ will make some tests and give you the feedback. I’m sure some of you will tell me how to improve.
Thanks again
I’ve tried with the convoy driver it worked but now I’d really like to try without it.
I’ve got some 3,7v batteries 21700 5000mAh
Some 18650 3200mAh Hom many ohms should the wire résistance be without the driver not to burn the led for a 5 seconds use ? ( I already burnt some LEDs years ago )
A friend told me it is very easy and will explain the basic calculation to me.
Thanks again
