In winter you probably also get less sunlight. I'm under the impression that most people would benefit from bright daylight during the day -- I have some LEDs i

In winter you probably also get less sunlight. I'm under the impression that most people would benefit from bright daylight during the day -- I have some LEDs in the daylight/6000K spectrum on a timer at my workstation -- even if you aren't diagnosed with SAD. Remember to keep them on during the _daytime_ only, though, to keep your body clock on the appropriate schedule!