Re: @Mike 126 -- Why is it
This is not something that has obvious advantages until you try it. My friend loaned me a couple Phillips Hue bulbs and and aside from using a lot less power than dimmer switches, they are the best alarm clock I've ever owned.
I have them set to fade in the lights with an artificial sunrise (I get up about an hour before sunrise in the winter) and it is a lot less jarring than an audio alarm.