I’ve got a Convoy 3X21B with 3x XHP70.3 HI emitters, and it’s factory rated at only 12,000 lumens, which seems low for what it is. Does anyone here know why it’s so underdriven, especially compared to other Convoy lights?
Are there any reasonably easy mods I can do to significantly increase the power output? I don’t really care about the extra heat or reduced runtimes as I don’t leave it on the higher modes for long.
That’s 4000 lumens each LED. Even for an XHP70.3 that’s decent, more than a lot of other convoy lights run them to. For something to look twice as bright, you need four times the brightness, so it might not even be worth increasing the lumens by a bit. Also, what driver are you using, if it’s a FET, better batteries might make a difference.
Going by the specs of the 3x21B, the light is powered by a 6V 15A boost driver, with 3 pairs of wires, delivering each LED 6V 5A.
It being a boost driver, there isn’t anything easy to do to boost output. Just make sure you have some quality batteries that can deliver the required power, but with the ‘hard limit’ set by the boost driver, that shouldn’t be too hard.
I checked the Convoy website, but couldn’t find another driver that would also work, given the voltage and the specific driver size of the 3x21B.
The only way I can think of to boost the output, is to modify the driver itself, but if that’s possible and what gains could be made, is way above expertise level!
Correct, and I’ll also add that the sense resistors on the 3x21B driver are R010 for each channel, so trying to up the output by stacking/swapping those will likely not increase output by much if at all. It’s already close to topped out.
Hi @SMOKEU , heres some food for thought,
@grzybek337 made this comparison
I have the the Astrolux ec06, yet i still need
want the Convoy 3x21b 
Cheers🔦
What a monster link, this goes to the same place UPDATED - Budget Sodacan Comparison - Convoy 3x21B vs Sofirn Q8 Plus/Astrolux EC06 vs Lumintop GT3
Cheers 
