The best way is to get special daylight bulbs. Look aroud your hardware store for them. I\'ve found them in 70 watt but believe me they are tons brighter than regular ones! They looks slightly blue, this helps bloack out yellow light that may screw you up when you\'re mixing colros and looking at your work. I\'ve found two types: a regular daylight bulb that\'s pretty cheap, and one for use with plants. The plant one is about $5 for one... though it was worth it, as it was te best light, the other ones do it\'s job just as well.
PS: Read the directions to the bulb, some get hotter than regular ones and require a ceramic fixture.