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What would be the limiting factor if using an HID car light bulb to use in a custom built flashlight? I have seen them advertised at 2000 lumens and up.
Your question is rather generic so I'm not sure what you're looking for. Are you a flashlight manufacturer or someone looking to purchase one?
As with any high draw, portable electronic device, battery technology is the limiting factor. More wattage and run-time = more needed battery power and thus greater size. Price is also a limiting factor. HID lights do exist with all the best attributes but they're often very expensive.
I'm someone looking to buy a flashlight. I'm looking for something along the lines of the Oracle, which seems popular to most users here. Same brightness, throw, divergence etc... though I don't want to spend $200 for the light. So I was wondering how possible it would be to build one for cheaper. What kind of snags do you have to pay attention to. etc...
Example here.you could buy a 6-10 mcp 12v halogen search light, than replace halogen bulb with one of those hid kits, you need one with slim ballast and bulb of the same type as halogen that was originally in the light, the light will run you about 30-50 bucks, hid kit is about 50-70, i converted mine halogen searchlight into hid.