I change the times the lights are on to match the sunlight outside. If we only get sun 9-10 hours a day instead of 12 or more, then so be it. But I don't like having the lights on for them if it's dark outside, it just feels really awkward for me, like they're looking out the window and thinking "huh? Is it nighttime or not?" But I don't change anything else unless I have to - sometimes if your house is much colder than usual you might need a stronger bulb to reach the same temps you were getting with a weaker bulb.