PanthaVS, you probably wont fry your wiring. There are guys here who have done it and sometimes dont need to do a thing, not even replace the fuse. You can also upgrade your wiring for the lighting circuit if you wanted to.
The bulbs that DannyboyDS suggested are high beam double the current too, with low beam being standard 55W - but you cant assume that a person will use high beam less. At night there are places where you can easily find a stretch of road and drive for hours with high beam on just about all of the time.
I dont know if green is the most visible to the human eye? as I have read other things. I think there is more to it than just one colour being 'most visible'. The eye and brain can differentiate more greens than other colours, I think that is why the night vision goggles are green? You definitely would not want your headlights being green as all you would see would be the green objects - you would not see any other coloured object. You (in theory) would not see the red stop sign, or the brown kangaroo in front of you or the drunk with a yellow t-shirt. You want white headlights, so that all colours can be reflected back to your eyes (white being a combination of all colours).
The only problem with choosing a bulb based on its lumen output is that manufacturers don't always put that information on the product, because they may not even have it, and can also use other measurements to measure the output - which you cant really convert to lumen's. I also read this on wikipedia:
"Luminous flux (lumen's) is not used to compare brightness, as this is a subjective perception which varies according to the distance from the light source". When I purchase a bulb for the house, you can compare the lumen's (seems to be common on household bulbs) and choosing a higher lumen output will mean a brighter bulb. Obviously at the same distance the bulbs will appear brighter/darker based on the lumen output - would be good if the manufacturers did the same for car bulbs.
