Four 23w and one 42w Daylight CFL bulbs. The mylar is kind of messy. The glue stick didn't work out very well. It's mostly held in place by the tape at the top and bottom. And now I have a LED spacer! Glorious!Warning! I broke one of the bulbs by screwing it by the tube instead of the base. I probably only spent about 12 hours actually working on the bucket itself. I could probably do a second one in 8 hours or less, and do a much better job.