Beam Shots are up - Modifying a 109 LED flashlight to an 18 XP-G2 FETlight

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@Old-Lumens

Anyhow, it wasn’t worth all the money. I am seeing only 15.28 amps on turn on and then it drops like a rock, due to the single cell. I would guess that on turn on, it’s about 3,000 lumens and by 30 seconds, it’s probably all the way down to 2,500 lumens or less, so it was a loss and not a smart mod.

Sorry to hear it. 15A should have given you a lot more than 3K lumens. And I don’t know how you can tell the difference, eye-ball, between 3,000 lumens and 2,500 lumens. Could it be that your starting point is actually much higher?

Sounds like you need one of these to quantify the results: The Legendary BLF Integrating Sphere starts here! (Delivered)

As to salvaging the project, is it possible that the LED’s are being underdriven? I’d suggest cutting half the LED’s off and checking the output with just 9 LED’S. Just a thought, anyway.