Lightbulbs

i have a 1998 4runner, i was wandering ifa any of you know if i could change the headlightbulbs from factory to some with a much more power, also the reverse lights , do any 50 watts fit the reverse lights? i have a problem that i cant see at night , so this may help. id appreciate if any of you have any ohter advices of the sourt, since light is very important here where i live!!!! thanksl

Check this:
http://www.designtech-intl.com:8080/merchant.ihtml?id=12&step=2

Found another place:
http://www.performanceproducts.com/CategoryPage.aspx?category=Lights%2c+Lenses%2c+%26 +Bulbs&subCategory=High+Performance+Replacement+Bulbs&subCatID=90&cid=16#product