You won't need a heat source at night if your room temp is 80s, the only time you will is if the room temp is below 55ish. During the day is different, they do need the lights on. during the day they need a basking spot of about 100 and a cool side in the 70s, plus the hides and sight barriers like usual. I usually give my russians 12-14 hours of UVB light during the day, and then at night I don't give them any extra heat source (unless it is below freezing out in which case my house is usually a bit too cold and I use a CHE for night time heat) During the summer my russians are outside so I don't use lights or heat sources it is only in the cooler months.