Re: those cheap LED torches
:welcome:
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All 3, depending on your luck. Some will work, some will be DOA, some will work for a week or 2.
are they gona be junk and not even work , or will they work? or work for only a litle while?
Those torches work on 2*AA (3V dropping to 2V), 1*CR123A (3V), 1*
RCR123A (3.7V, 4.2V hot off the charger)
There is a big difference running at 3V dropping to 2V and 4.2V dropping to 3.6V.
If you go to selfbuilt's CR123A/RCR123A roundup and look up the Quark Mini 123 in both the CR123A and RCR123A charts.
https://www.candlepowerforums.com/threads/201117
RCR123A 4000 lux at 4.2V (direct drive)
CR123A 2510 lux at 3V (boost circuit). This should also be equivalent to fresh 2AA at 3V.
As the ebay lights are 1/14th the cost of the Mini I think the boost circuit may be less powerful and provide less light than the CR123A number above.
To get the most light from those torches you have to buy
RCR123A batteries and charger. AW protected RCR123A are $6.99 each and a Nano charger is $7.49 plus shipping from lighthound. You can get the batteries direct from AW over at CPFMP.
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Here is the runtime graph of a Cree light direct driven with 3*NiMH AAA (4.05V hot off the charger).
Even with the rather flat output of NiMH batteries, the output drops from 130 lumens to 85 lumens before it stabilizes.
At the price point of the ebay lights, I do not think you will be getting premium bin LEDs so I think the above graph will indicate the number of OTF lumens you will be getting.
When you run the ebay light from 2AA (3V dropping to 2V) it will be much worse. You will slowly drop from ~70 initial lumens until the light conks out.
Still it is much brighter than the 2 to 25 lumens of the 2AA incan or 3AAA 9LED torches found at the supermarket checkout counter.