Re: what watage bulbs should i use? (gti_matt)
The getting higher wattage ratings out of lower wattage bulbs thing is BS.
I also agree with gti_matt about the coatings on bulbs...forget it. Anything they coat onto the bulb will filter the light to some extent.
If it were me, I'd go with these http://www.jcwhitney.com/item.jhtml?ITEMID=67301
because they are 55W low beam, which will keep you from getting a ticket or blinding people, and they have no coating, and they jump to 100W for high beams.
The e-code H4 bulb is built different completely, allowing a razor sharp cut-off on the low beams. This means I can run 100W low beams and never get flashed...which I do
The 9004 bulb kicks too much back up (on purpose, as per DOT rules), so running high wattages on low beams almost ensures blinding someone. Stick with 55W low beam, until you can get e-code lights.
I also agree about the heat...be sure you aren't melting anything if you do not have a metal reflector and a glass lens.
For info on how to aim lights, and tons of light info in general, check out Stern Lighting's