I use a solar rope light I bought at Lowe's for about $20. I have cup hooks around the top interior to hold it and the wire goes in thru the door. I bought it 2 years ago ans it still works great. I have gone out there up to a couple of hours after sunset and it will still be on, but the light dimmed. That is one of the great things about it...the light slowly dims an the goes out. No sudden off when they are not prepared
These are great for winter mood lighting! Led are not expensive to run. Reg christmas lights are pricier.