OP here. I've been using F.lux for several years now. I really can't understand why anyone would not use it. It's so easy on the eyes.
If you like F.lux and you're an OSX user, I'd also recommend using it with Toggle Screenshade [http://screenshade.en.softonic.com/mac]. It doesn't change the color composition like F.lux does. It just reduces the brightness of the monitor well below OSX default minimum. It's shocking little light that gets through. Give yourself 2 minutes to adjust in a dark room, and you'll still be able to see the monitor, but with much less light intrusion on your body.
Second, if you're getting hardcore on this. You should also buy a orange plastic screen shade from Low Blue Lights [https://www.lowbluelights.com/products.asp?cid=16] or make one yourself. I have one rubber-banded to my monitor at night. It ~triples the effect of Flux.
If you like F.lux and you're an OSX user, I'd also recommend using it with Toggle Screenshade [http://screenshade.en.softonic.com/mac]. It doesn't change the color composition like F.lux does. It just reduces the brightness of the monitor well below OSX default minimum. It's shocking little light that gets through. Give yourself 2 minutes to adjust in a dark room, and you'll still be able to see the monitor, but with much less light intrusion on your body.
Second, if you're getting hardcore on this. You should also buy a orange plastic screen shade from Low Blue Lights [https://www.lowbluelights.com/products.asp?cid=16] or make one yourself. I have one rubber-banded to my monitor at night. It ~triples the effect of Flux.