I've never used UV lights for my snakes. However, I am very interested in the effects of UV especially if it helps the development of colours of the snakes.....
I don't think it matters if day or night time is simulated according to the real day and night cycle as long as there is a constant day and night cycle....
Would exposure to too much UV have any bad effect on the snake as well?
I know that UV is not neccesary for snakes because many have successfully kept and bred their snakes without UV......