Texas_Ace BLF Calibrated Lumen tube / Sphere No math skills needed - Several spheres still available

[JasonWW]

@Bob_McBob

@JasonWW

I would expect that output with the 219C, but I’m thinking the LH351D should be close to stock output levels, right?

With FET drivers it depends on the amperage it’s pulling. You need max voltage to get highest output. Are you using button top or solder blobbed 30Q? Have you tried measuring it with only 3 cells and 2 cells to see if you get reduced output?

Are the battery ends and driver ring clean? Are any springs looking burnt or collapsed? Do all the cells drop to the same voltage after using the light for a while?

Does it still heat up real fast?

The measurement is with button top 30Qs from a reliable source. Flat top GAs produce a proportionally lower turn-on output of 3270 lumens. Cells discharge evenly and the springs look perfect. There was a small amount of crud on the contact ring, but cleaning it made no difference. The surface temperature of the head reaches 60°C within 3 minutes.

Testing turn-on lumens with different numbers of cells:

1 cell (briefly) - 2140 lumens
2 cells - 2880 lumens
3 cells - 3300 lumens
4 cells - 3540 lumens

Hmm, I don’t know. You might try posting on the Modded Q8 thread. Maybe someone there has tried those leds in a Q8.