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I use a beleuchtungschalttafel-3000L which can run off a portable laptop battery or other small battery (12-32Vin). The phosphors are separate from the unit and can be swapped to change the color temperature (I have four, 3000K, 3500K, 4000K, 5000K). It draws around 40 watts at full power and heat isn't a problem at typical temperatures.
with the phosphor:
without the phosphor / internals:
I've used it for a combination of night photography, macro work, and just general lighting for video or other. It's definately an improvement from the Beleuchtungsvorrichtung-1500L which has some problems with overheating and efficiency.