Involvement:General (knows how to use it) - Ownership:1 day to 1 week
Greatly extends runtime. Perfect fit. Well built.
Won't increase brightness (or only very little).
Because of the regulating circuit, the C3 is already at full brightness with a single AA cell. So you won't get much, if any extra brightness from more AA cells.
But, a single AA cell gets a huge current drain from the circuit. Using two AA cells will more then double the runtime (so you get more light then when you would use 2 x 1AA in sequence).
This is mainly cause the circuit is more efficient at higher voltages (I've tested this with an amp meter :) 2xAA draws -less- then half the current of single AA cell.
Also, I ordered a 2nd tube to go for 3xAA. But this in hindsight is a bit of a waste, you only get some more runtime, not more brightness (and not as much runtime as from 1 to 2xAA), and you have to be careful not to use anything but NiCd/NiMh 1.2V cells, 3x1.5V plain batteries would put out 4.5 volts, and -fry- the led.
If you bought a C3 with no extension tube, this is -highly- recommended, but expect longer runtime, not higher brightness.
Buying it for 3xAA should only be done if you're crazy, like me ;) Or if you occasionally have a need for very long runtime, or if your shop only sells AA in 3 packs :)
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