Candle Power Flashlight Forum

Candle Power Flashlight Forum

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Having looked at the cost of 'decent' LED and HID bike lights I've decided it would be fun and (possibly) cheaper to build my own.
I've got some XR-Es and some 4 and 9 Leidl optics on the way from Cutter.
Can anyone give me an idea of what I'll need re. batteries etc?
Was planning on 2 XR-Es per light and running them at 700mA using a BuckPuck from Lumileds. Is this likely to be OK?
What batteries are best to go for- 7.2V li-ion pack/18650's/AA NiMH's?
Anyone else tried/planning something like this?
TIA
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