If you want to feel as if you are naturally waking up before the sun rises without jarring yourself awake when your alarm goes off, use this bulb.  There is nothing like peacefully waking up because your room is brighter.  I can't recommend it highly enough.  Other bulbs do the same thing, and there are even “alarm” lamps you can purchase; however, this is the only product I’ve used, these bulbs have lasted well over a year. I can’t say enough about them.