Yea @Esrgood4u it's a struggle for me too when the outside temps start dipping into the single digits to keep lights out temps above 60 I flipped my light schedule over a 3-4 day period so lights are on during the coldest outside temps. The little space heater is on low outside the closet that these are in. It keeps the ambient room temp low to mid 60's lights out and mid to upper 70's lights on.
High today low 20's with about 6" of snow so far and a overnight low of 4. Outside temps for tomorrow are 15 high with a -10 low. it's the wind that kills me in this leaky old partially insulated house.