I found out by accident that i don't need a light kit inside. Was having problems with my homemade light and forgot to turn it off. Set it in my office without light and noticed it was still on and reading ready. Decided to shoot through it to see what happens.could not believe it when it read correct speed without light above it. I have an 8' white ceiling in my office and it reads the same as it does outside every time. Go figure.