If you're going to try bright light, I recommend the bulb I bought. It fits in normal sockets, uses a reasonable wattage, the light it generates is pleasant enough, and it's cheap.

Changes in energy have been small, and most noticeable in the mornings. I have not compared against, say, my goLITE, largely because I don't have a precise enough way to measure energy, but subjectively it seems comparable / possibly more effective. Given the tiny cost involved, I think it's worth trying, but subjectively it isn't revolutionary. (More careful statistics might show a larger effect.) It does seem effective at helping me stay up late, but since that's something I don't want, making sure to turn it off at a reasonable time is a recommended habit.