I'm researching this because I recently obtained a lot of infrared film. Turns out there's a huge variation between flash manufacturers in the amount of infrared they put out. For portable flashes, it seems Metz (45CT and 60CT series) is the best for infrared, or the most wasteful if you're shooting something else. I have both, if I put an infrared filter over the flash instead of the lens, I should be able to photograph at night completely incognito. Of course, calculating exposure is problematic....
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