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That is very true that they are not going to be very bright, 400 lumins is about the best you can hope for if they can put out 70 lumins per watt, 40 lumins per watt is pretty common for cheap LED's but some of the better ones are getting up to the 70 lumin range, Car headlights tend to be closer to 800-1200 total lumin output.
I wouldn't want to introduce fresh air into a head light either, even with a decent air filter you are still going to get a fine dust building up on the inside of the reflector over time.
Even with that, they are still an impressive LED and cheap too, they would work great for other uses if they didn't have to hold up to being on for an hour or so at a time.
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