Even with the best Eneloop Pros in it, if its a real 500 lumens, i would guess a maximum time of couple hours. I learned long ago not to believe the claims from manufacturers on the packages.
I know but dang that is a DRASTIC claim for them to make. I have no way of measuring lumens but I do have another 520 lumen flashlight. Tonight when it gets dark I will turn this spotlight on and tail stand it… I can check periodically to see how fast it drops.
I am surprised how inflated it is, anyone could measure it easily, and its not from a chinese website, i smell class action lawsuit (maybe i have driven through too many states advertising injury lawyers) :bigsmile:
I assumed it was LED lumens so i checked how many watts it takes, multiplied 2000mA eneloops times 1.2V and divided battery watts by LED watts. I’ve noticed many boost drivers are in the 50-75% efficiency range, this one would be a buck driver (or maybe linear but that would be horrendously inefficient).
I think you will get 1-1.5 hours, though make sure its not getting too hot but still shedding heat otherwise you could burn out hte LED.
Well if Cree states the emitter can produce 1000lm at max rated current under laboratory conditions, and the best cells can produce detectable light on the lowest mode for 50hrs., the the box will say
Edit: used wrong bin
By my calculations using Duracell 2650mA batteries at 90% driver efficiency if you want 10 hours of battery life using an XP-L on sinkpad you would get 310led lumens, expect 225-250 lumens OTF
Thats the highest capacity NiMH i know of, with the most efficient LED available on a no dielectric star.
The package shows it as ANSI FL1 Lumens……
So it puts out 500 lumens for 3.2 minutes then drops to 11% for the rest of 10 hours…
That meets ‘ANSI standards’ for output and run time.