Simon, I see you’ve released a remote switch for L21B. Is it possible to remove the remote switch from the L21B tailcap and install it in any other Convoy 21700 flashlights with a tailswitch? Perhaps S12 IR?
Are you speaking about the 12-groups switching buck driver with up to 8A output?
Despite what Simon says, using a high current driver means that if the conditions are met (this is, enough effective input to output voltage difference, and low enough emitter Vf), the current at the emitter could go above the maximum it can tolerate. When I say “effective” I say it because the input voltage at the driver diminishes as the input current goes up, because of current path resistances (springs, switch, etc.).
The correct solution is always to adjust the output current at the driver, this requires adjusting the sense resistor value in it. The advantage of this approach is that all the driver modes will upscale or downscale proportionally. For the 12-groups high current buck driver, swapping the stock R010 with a 40mΩ unit (R040) nets a maximum of 2A at the output, and with a 33mΩ one (R033) the maximum output current would be 2.4̅2̅A = ≈2.425A.
So, once again… I have to sing the praises of Simon and Convoy. My S11 FC40 developed an odd driver issue, on mode option 1.2 the 2 low modes worked fine and the three upper modes were all the same dim brightness and the light was always indicating low battery voltage. Contacted Simon about the issue since I wanted to be sure to get the correct driver ordered… he just sent one.
Put it in today and the S11 is as good as new. I really like this one and the M21B with the FC40, would hate to not have either one of them.
I can test this sometime but in theory the bottleneck of the thermal pad should be apparent on very short timescales. Longer tests basically should show the difference of the thermal path further away from the led.
Heat starts at the LED junction then goes through: Die > Substrate > Solder > MCPCB > TIM > Heatsink > Air. Anything after the MCPCB should not have an impact in any difference between the two packages. My strategy for testing this would be to actually float the MCPCB in air and do an output test that way at saturation temps. The only thing I can see making a difference at longer timescales is the loss of the thermal ‘driving force’, i.e. the delta Tj and Tmcpcb.
The tests that I do though are pretty aligned with real-world use though. Always open for debate, but let’s do that in another thread maybe :+1:
I’m planning to order S2+ with LH351D (5000K or lower) or maybe SST40…
My question is, what is the different between “Ar-coated glass lens, Smooth” vs “Glass, Orange peel” lens.
I have a flashlight with TIR optic and I really like it. Shall I get also some TIR optics? Is it hard to change by myself?
(Also there are 4 different option type on Convoy store. Bead, flat, matte and striped with several degree)
Thank you so much!
Any suggestions will be a big help
I’ve created a new post here with some of my thoughts on how Convoy’s user interfaces can be improved. I would love for the rest of the community to take a look and tell me what you think, and I also hope Simon will take a look and see if any of these improvements are feasible.
I installed my sft70 LED in the s21b xhp50.2 light and it worked fine on mode 1-3, turned blue on mode 4 (100% output).
I then installed the SFT70 into my m21e and it worked up until about 75% ramp, then turned blue and the light started smoking. I thought i blue the sft70..
But now my m21e wont turn on with the xhp70 in it either. I put that back in and it wont work.
Can i buy just the driver for the m21e from you?
does anyone know what i did to my driver? i wouldve thought that just the led would burn out if anything, and i was completely OK with doing that for the sake of expirementing.. I didnt think it would ruin the driver..