Thanks,
No doubt the fan would eat most of the power, thats just another engineering challenge to overcome. There doesnt seem like a better way without making the flashlight huge, then again the scale of power I am used to is an several orders of magnitude greater than what she uses, I probably have a scale bias. Im sure she could design an innovative passive and small heatsink.
Idea: using PCM you could make a flashlight that you recharge in the oven.
Combining ideas may make sense here. A flashlight with PCM and a black handle that you can leave in the sun, and optionally wrap in a soaked cloth. Perhaps PV makes more sense, but I haven't run the math.
Of course, you'd also want a thermos to carry it in. ;)
Idea: using PCM you could make a flashlight that you recharge in the oven.