I recently built two, almost identical T08s, one with a BLF17DD driver the other with a Q-Lite + 8. Tailcap amp readings have me a bit confused.
Other than driver choice builds are identical, removed all components from the original drivers and used them as contact boards. 20ga silicone wire from the contact boards to the 17DD/Q-Lite, drivers potted with Fujic. 20ga silicone wire to identical, Dedomed XM-L2s on home made DTP MCPCBs.
All modes work properly on both light, including the step down from Turbo on the 17DD.
Here’s where I’m stumped:
I’m using a Fluke 88 to measure tailcap amperage, a set of stock Fluke leaks cut down to 10” with a 1” piece of 12ga copper home wire soldered to the - lead to bridge the two batteries.
With the Q-Lite light I get consistent 6 amps regardless of batteries used.
With the BLF17DD:
Samsung 25R, 4.95a
Samsung 20R, 4.90a
AW IMR, 4.8a
All batteries fresh off the charger
I realize I’m using the stock Fluke leads but they’re rated for 10a and a fraction of their original length. It doesn’t really matter anyway because I’m using the exact same setup with the Q-Lite.
I’m not sure what I was expecting to see from the FET driver but thought it would be higher than the Q-Lite. The only thing I can think of is a high resistance connection somewhere between the contact board and LED. Kinda wish I hadn’t potted everything.
For what it’s worth, both lights are very nice and I can see no appreciable difference in output. In fact, the FET light measured a corrected 159kcd* to the Q-Lite’s 122kcd* though the FET light may be better focused.
- My output numbers are only relevant my output numbers…
So, anyone want to venture a guess at what I did wrong? As I said, I’m stumped.
s.
One of the things that keeps me at this hobby is that with every success or failure, I learn something.
This time?
Despite a full amp difference I can’t see it, outside, side by side.
Despite more than more than 35kcd* difference I can’t see it.
Throw away the ammeter and lux meter, go outside and turn it on!
Always test, every step of the way (I though I had learned this a while ago, the combination of two batteries, contact board, driver, LED and only two hands led me to only check for shorts while building).