Ok Trav, just got off the phone with John...and this is what he had to say: Changing stock 55w bulbs to a 100w is like a 80's-90's poor mans upgrade to get better clarity out of your bulbs, and with bulb technology nowadays, you will get way better vision from a good quality 55w than you would by a simple 100w or 150w upgrade. Besides that, unless you go to the expense of altering you mounts & wiring, you are seriously risking melting them, and should that happen, bye bye insurance... For about $30 a bulb, Philips do a 55w +80 which is a bulb about half way between your standard yellow tinge bulb and a white light, providing around 80% extra vision that a standard Narva 55w. If you don't mind spending the money, you could spend around $100 for a set of Philips Crystal Visions which are a almost white light with fantastic vision. John installed these on his Territory and I had them on my Corolla, and we have also put them on a swag of other friends cars.....no complaint and awesome feedback. If you want to spend extra, you could go to the Philips DIamond Vision..... My recommendation is the Crystal Visions, I know $100 is a fair wack of cash for a couple of small glass things, but by the time you buy a set of 100w, then pay money for upgrading your wiring etc, for peice of mind and also better quality, i'd recommend the crystals... Hope this helps... Azza :)