Battery for flashlight to live in the hot sun

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Modding My Lawnmower Headlights to two XM-Ls (& misc info)

I would like to replace the headlights on my small lawn tractor with 2 XM-L's. I'm not sure which way to go for parts - ready made drop-in or a complete D.I.Y. build. I want really floody light (I have no need to spot things out at 1000' while riding my mower!). I have thought about using two CPU heatsinks (I have access to many used/spare PC parts) and mounting the emitted to the flat end (where the CPU would have been) and then somehow mount the driver. This idea really doesn't enclose thi…