Surefire L5 Lumamax current draw?

[Greg G]

Does anyone know off the top of their head what current the driver in the Surefire L5 supplies to its LED?

Thanks!

 

[Entrekman]

Does anyone know off the top of their head what current the driver in the Surefire L5 supplies to its LED?

Thanks!

Last time I measured, it was 1050mA measured from the battery end.

and suprisingly my L4 was drawing around 1400mA, it's really high. Being said, I think I'll go measure my wife's L4.

 

[Entrekman]

I just got new measurements, L5 is 1050mA, L6 is 680mA, L4 is 1200mA. (These are taken with Sanyo primaries)

There is a weird thing with Tenergy batteries. Both the Tenergy primary and their RCR li-ions only provides 850-900mA to the L4. Maybe their internal resistance is higher than Sanyo's? And I can definitely notice when using Tenergy, the L4 is a little dimmer.

 

[ja10]

I might be wrong, but I think that if a light has a converter in it, you would actually have to remove one of the wires between it and the LED and insert your meter in order to measure the current to the LED. You measured the draw from the battery, which can be useful, but you still won't be sure what the board is doing with that current.

Someone smarter than me can pitch in, but I think that's correct.

 

[Bullzeyebill]

The question was current to the led. The KL5, KL4, KL6 usually run about 660-700mA's to the led. Vvoltage measured at the tailcap end can vary, depending on the vf of the Lux V. KL6 runs on three CR123's so voltage at tailcap will be lower than the KL5 and KL4.

Bill

 

[Entrekman]

I'm not familiar with how the Led system works, but how is it that 3 123's can have a lower voltage than 2 123's in a series? Would you help me to explain? Or do u mean a lower current?:thinking:

 

[Entrekman]

and what in the hell is Vf? I still don't know how does it affect the led.

 

[Bullzeyebill]

Whoops, I mean current at the tailcap would be lower with three CR123's with the KL6.

Bill