For me the change of light doesn't affect mood (I love the gloomy winters here! #aesthetic) but oh man it does affect energy.

There is not much special about the depression / circadian control lights. Previously I had a 5-headed "squid lamp" from Target and stuck 5 bright "daylight" LED bulbs in it and put it behind my desk pointed at my face at the office. Regular lights work fine but they have to be BRIGHT and "daylight" color.

I use the lights for circadian control so for me they're on 7am to 5pm. Aside from my desk, they also come on by my bed on a timer whether I'm up or not. Between the lights and 0.2mg melatonin microdose at 11pm each night, my sleep has never been so well controlled. It really helps.

I'm a lighting nerd so if anybody wants recommendations on what to get, just ask. Remember, it needs to be BRIGHT.