Thread: Spot lighting torch

Originally Posted by Quick

After reading this thread, I picked up a Convoy L21B SFT40 2000 lumen....

....I got them directly from China

This has been bugging me since you imported directly from China and probably aren't familiar of what to check. I'd recommend following this list for your safety and to ensure your torch continues to function properly.

1. Check both retaining rings are tight around the driver and tail springs.
2. Check that the two screws are tight that hold the LED's MCPCB down.
3. Buy 99% Isopropyl Alcohol and using a Q tip gently clean the LED's surface. Do this too hard and you'll break the bond wires.
4. Make sure you use button top batteries if you plan on mounting the L21B.

I clean the LED on every unit because there's often left over flux that ends up burning into the LED. The screws are often left loose so the reflector centers the LED when tightening down the bezel. I've had units arrive with the screws rattling around or ready to come out, if this happens it'll create a short circuit. Be careful when reassembling and tightening the bezel, do it too hard and you'll risk tearing the LED from the board.

Convoy is a DIY brand, so if your light fails you'll more than likely be sent parts to solder in yourself.

I recommend button top batteries for mounting because the recoil causes the spring to dent in the positive terminal. There's a pressure relief vent behind it that you don't want blocked. I've seen torches explode due to battery issues with windows blown out and shrapnel lodged in walls and limbs. If you're not super careful you'll end up with a pipe bomb. Lithium safety is super important. Years ago a person died by having a battery explode inside an Olight torch sending it down the guy's throat, he was holding it in his mouth. It was user error by using two batteries of unequal voltage.

Anyway, I hope this helps.