I have one but I can only use it some years. If I am not stable it causes mania. Mine is similar to the Litebook described above except it was the first model like that. I like (and need) that it has settings that adjust so that I control the light intensity and timer. In the past I've started very low and for a short time and worked my way up as tolerated. This year I'm too unstable to consider it. I probably use it every other year on average. I know the year I moved here my house was being built and it drug on for many months longer than it should have. So I had packed it in a storage unit. I finally went to the unit and tore into many boxes until I found it because that year I really needed it.

It's a great help and I wish I could use it more often.