I have a big umbrella that i have near a window is it alright to let him sit on that for awhile without a uvb and basking spot or do i need them also how long is alright?
I would recommend cutting down a tall branch from a tree and proping it up securly in a corner. I love to watch my two walk and climb all over them. They rarely come all the way down and walk on the floor.
Being without UV for an hour or so is fine. After all, wild chams don't spend every waking moment of their lives in direct sunlight and our captive ones don't sit under the light constantly either. Lack of UV will cause accumulating deficiency problems over time, not for short periods. My free range melleri didn't spend that much time directly under their Reptisuns, but they did get exposure each day.