HDS U60XR

How hard does the HDS U60XR drive Its LED on high?

500-600mA?

30min runtime seems a bit short?

There is no specific drive level. Each light was calibrated to the emitter to produce 60 lm. If you had an inefficient emitter it would drive it hard, while an efficient emitter would drive lower and might last a lot longer.

30 min was guaranteed runtime, it was often a fair bit longer.

I had a B42XRGT that ran 49 minutes on max with a Battery Station RCR123.

also remember that was a full 60 lumens throughout, not to 50% brightness.

Ok, thanks for the responses.

So does the HDS U60XR knows how many lumens it's producing :thinking: ?

skalomax said:

Ok, thanks for the responses.

So does the HDS U60XR know how many lumens it's producing :thinking: ?

Click to expand...

It knows exactly what current is going to the emitter, so in a way, yes.

Valpo Hawkeye said:

It knows exactly what current is going to the emitter, so in a way, yes.

Click to expand...

Oh, cool.

thanks Valpo.

skalomax said:

Ok, thanks for the responses.

So does the HDS U60XR knows how many lumens it's producing :thinking: ?

Click to expand...

Each light is calibrated at the factory during the production cycle. This equipment and method got sold to Novatac. One hopes they are using it.

HDS and now maybe Novatac are the only companies to use this method. With LED's there can be a fairly high variance between LEDs in brightness and efficiency, this could easily be >20%. Most companies set a fixed current so runtimes are about the same, but brightness varies from unit to unit.
With HDS the brightness was fixed but runtimes varied from unit to unit.

Read the excellent LED Flashlight White Paper on the HDS website for a better understanding of this and other design criteria of the HDS lights.