If you mean for basking, i get clear, regular (not spiral) light bulbs. Typically my room temperature is 69 degrees, so i use 60 to 75 watt bulbs. If your question is about UVB, you need long flourescent style bulbs, Reptisun 5.0 from LLL Reptile seem to be the cheapest.
Yea they will still need a light depending. Is the cage always in the sun or are u moving him out there from inside? If your moving him out there, you should minimize the handling and keep him in his cage. The outdoor days should only be a treat for him..maybe once a week or so. He will get his required amount of UVB from the lights. If he is permanently outdoors..he can regulate it on his own and a light is not required...