But a conservative guess would be ~ 750 initially and then going down. To me half of the attraction would be whether it can drain the batteries properly, maybe even beyond 0,9 V. I have a few lights that will do that and I love that when I run them on primaries they will not turn off until those batteries are EMPTY.
If it has a decent spacing between high and low then the runtime on this should be very good actually. 5 C cells are around 1,6 V initially and then down to say 0,9 V for a total discharge of about 4000 mAh (going by memory here so please correct me if my numbers are off).
Rough calculation of power is 4000 mAh * (1,6-0,9) = 2800 mW
5 cells => 5*2800 mW = 14000 mW
2,5 A initially to the led and 80% efficiency would give 3100 mAh consumed at the batteries and with a 3,2 V Vf of the led it would consume 9,9 W giving about 85 minutes of runtime on high. Actual numbers would be higher since I don't thing the driver will hold that so maybe 3 hours until the output is half of initial turn on. On low the output is probably something like 30% of high so the runtime would be 5 hours,
But this is all academic since I know of no reviews, I dont have the light and I have been waiting for a review to pop up but alas none has.
But the size of the head probably lends itself to a good balanced beam with fair throw and fairly bright flood of a big area in front of you.
You know what? I may have just talked myself into getting one to see if I am totally off with all my speculations here :-)
Only battery tubes for 26650 will fit C-size cells,
if it’s meant for 18650 only it’s too thin (~18mm)
According to Wikipedia C-size is 26.2mm dia × 50mm long
26650 is obviously 26mm dia x 65mm long (nominal, may be longer with protected cells)
so 3x 26650 should be ~195mm long, 4x C-size 200mm long
that is wonderful! if all 3x26650 lights can be replaced using 4x c cells, then heres another option for ya. the skyray 9xml light. but you should wait to see if others can chime in and confirm that 4 c cells will actually fit. if so, this would be the light to go for.
Mechanically/dimensionally 3x26650=4xC-size,
but if the driver doesn’t support the low voltage of 4x NiMH it might not work.
But it’s confirmed for TR-J12.
I also tried it on a TR-J18 that I have, but current draw with 4xC-size was a lot lower (only ~2A)
so with that one it doesn’t work as well.
Should be receiving a 9x XM-L soon, will see how that fares with NiMH
I had the “777” Smallsun.
It threw pretty well and was as bright as you would expect.
I think it was not regulated or something, since it faded pretty fast with Alkalines…
How does the UF 7t6 compare to the J12 or J18? Kind of interesting it’s not called the 6t6 given it has 6 emitters (even though product description says 7…).