FM1794 in a 6P Questions

[midwestpilot]

I'm running the FM1794 in a 6P with 2X AW's IMR16340's. My first hotwire setup. A couple questions - any concern with discharging the cells too quickly with this setup, or any care tips for the cells here? Any way to make this setup brighter while staying within the 6P body? Approx. how many "out-the-front" lumens am I likely making with this setup? It seems to throw around 300 feet in my casual testing. Seems like a good overall setup, but I don't see it referenced here much. Looks like most use the 1794 with 3 cells. THANKS in advance for any tips!

 

[Gunnerboy]

I'm running the FM1794 in a 6P with 2X AW's IMR16340's. My first hotwire setup. A couple questions - any concern with discharging the cells too quickly with this setup, or any care tips for the cells here?

The discharge rate is 5.5C for those IMR16340's driving the FM1794. The maximum discharge rate for that cell is 8C, so not a problem. Ideally, you should keep doing shallow discharges on those cells and keep topping off their charges for maximum life. Don't leave them in a completely dead-state for very long.

Approx. how many "out-the-front" lumens am I likely making with this setup?

Theoretically, 419 torch lumens (628 bulb lumens x 0.667 = 419 torch lumens)

Any way to make this setup brighter while staying within the 6P body?

I can only think of going with FM's G4 D26 Sunlight and running a WA1111 for about 500-550 torch lumens. This is only a marginal difference in brightness, but maybe a prettier beam. The color temperature likely won't be as white (less overdriven) as the FM1794.

Looks like most use the 1794 with 3 cells.

No way can you use three li-ion cells, unless you have some sort of regulator. The lamp operates on the edge with two Li-Co 18500's, and is probably doing the same with two smallish (16340) IMR cells. Two larger-size IMR cells will likely blow the lamp.

 

[DM51]

As Gunnerboy said. It's a very nice "wow-factor" set-up, with short run-time (~9 mins) and in fact using it in the FM Sunlight holder I think it has a better beam than the WA1111, as it is a smaller bulb.

As Gunnerboy said, don't run the cells down to empty. Even if you don't time it, you'll know when they need recharging, as the brightness will dim quite noticeably. When that happens, switch off straight away, and charge the cells at the earliest opportunity - don't leave them sitting empty or almost empty.

 

[midwestpilot]

THANKS all!

 

[nfetterly]

I'm running the 1794 in a "12P" (FM 2 x 18650), with a AW softstart 3 level tailcap innards. I had a P91 that I put in my 6P that I'm running with the IMRs. Certainly not as bright as the 1794.

 

[cernobila]

As Gunnerboy said. It's a very nice "wow-factor" set-up, with short run-time (~9 mins) and in fact using it in the FM Sunlight holder I think it has a better beam than the WA1111, as it is a smaller bulb.

Something like that, the overall amount of light coming out is very similar between the FM D26 with 1794 and 1111. The 1111 is floodier and the 1794 has slightly better throw, the smaller reflector is more suited to the smaller bulb. Given that the 1794 has lower Amp rating, it may be the better choice for your needs......Check out the Incan beamshots in my sig line for better idea even though the cells used are not the same.