u cant compare single led with multiple leds
So are the specs false? Would the 6x Q5 drop-in be pulling a LOT more current than the "800mA @ 1200 Lumens" as stated? I'm trying to look at the current draw of the drop-in as a whole here. Same thing for the 5x R2 - drop-in, pulling a lot more than "1A @ 1200Lumens"?
Thanks,
Garry
Why can't I compare single vs. multiple? Why is it so hard?
Garry
They are in series. The current draw should be 4A for the 5xR2. Seems be be close to it.
By langedaenen
"Some data:
Current drown ( 2 fully charged 18650 )
Full brightness: 1.85A
Med brightness: 0.75A
Low brightness: 0.25A --> very long runtime :)"
Hikelite, which module are your specs for? Is that a post somewhere? Can you provide a link?
Thanks,
Garry
Gary, thanks for this link.. I havent seen that before! very useful!!!
I presumed that they stated 800ma for the 5xR2 drop-in, thats why I said 4A.
Here is the link to the efficiency of each emitter the T6 wins.
Some useful info at this link as well (1st post): http://club.dealextreme.com/forums/Forums.dx/threadid.747581. Guess I wasn't understanding where the current draw is being measured. So it really is "per LED" I take it.
Now I know I said throw vs. spill didn't matter, but any ideas? Would the 6x Q5 or 5x R2 or single XM-L module produce more flood (spill)? Do people generally go with multiple LED's to get flood? I know reflector plays into this a lot, but just go with these particular modules.
Thanks,
Garry
are u trying to compare multiple leds with single??
Garry, the most efficient drop-in you can probably make would be a true voltage regulated driver at 1.4A feeding an T6 XM-L. Use a driver like the Nanjg 101 AK with 4*AMC7135 chips. You will have plenty of output (500-600 lumen) and the best battery life.
the best is to buy both.. and you will find the answer 
I would recommend this also...
Wondering, has anyone made only 1000mA dropin with XM-L?
So, is it possible that I could replace the driver with a 1.4amp or less (ie. 1.0amp) and drive this XM-L drop-in from 2 D sized Alkalines? This would be ideal for me. Common size battery, yet large D size for runtime. +/- 400 Lumens sounds like plenty of light.
Thoughts?
Garry
How about this driver? http://www.kaidomain.com/product/details.S009113 . Says 0.9v - 4.2v 1000mA boost and buck current regulated 17mm diameter. Would this be compatible with the Dealextreme XM-L drop-in and 2 alkalines? Would the voltage cutoff of 2.75v cut off the alkalines too early?
New to the driver scene.
Garry
Might not be of interest any more, but here are some data on the 5*XR-E R2 and 6*XR-E Q5 drop-ins running on 2*18650:
5*R2: light output: 820 - throw: 330m - unfortunately I didn't measure the current.
6*Q5: light output: 850 - throw: 300m - 1.85A
Light output in arbitrary units (roughly mimicking lumens) measured via ceiling bounce.
How about the above mentioned driver running 3 alkalines? It says max 4.2v input and the alkalines would be 4.5 though. Seems with alkaline C's or D's I should stay at about 1amp max. Not sure what kind of runtime this would provide. Any ideas?
Garry
It's sold out for a very very long time now.
alkalines, seriously? that makes turning the light on cost alot....atleast look at rechargables.
Personally I'd love a light running on 2 or 3 d cell rechargeables, capable of 500 lumens for a couple of hours.
The extra width of the battery tube would mean a larger head wouldn't look quite as odd.