I believe the fuses are rated at 10 amps per bulb, so that means the electrical system should be able to handle anything less than 120 watts. Heat is another story, so you might melt stuff if you get bulbs that are too hot. I'm running a 9005 conversion (65 watts) now and used to have 80w blue ricer bulbs for a few months, both with no electrical or heat problems. The 9005 conversion is very much better, btw.
Yes i agree with weston, i had those ricer bulbs at 80 watts a piece and they have always seemed to burn out on their own at about 3 months of useage. Don't bother with them and just get a set of 9005 bulbs from sylvania and modify them to fit your low beams. Make sure they are rated at 65 watts each.
Trust me this is a big hassle with the 80 watt ricer bulbs. If i knew this earlier I think I would have bought the real xexon's by now instead of spending all of that money on many ricer bulbs. I also had one of those bulbs explode in my headlight unit and luckily i was under warrenty and I managed to fool acura to replace my whole unit for free.
what he means by modify is basically taking the bulbs that are supposed to be in the high beam, and cutting the guide so they fit in the low beam. you get a lot more light that way, and the housing is made so it doesn't blind anyone.