NASA is changing the lighting in the big space box. They have finally realized the importance of the colour of lights during the day. As a northern sufferer of seasonal depressive changes, you have to be real careful. Get a blast of bright bluish light in the morning, but warm out the light by evening. I think that at Christmas a lot of people might be getting these 'full spectrum' lights. Do not use them in the evening! I'm currently slowly replacing the most used lights with LED 'warm white' lights.