Hi there! I was wondering how many hours daylight/UVB should my one year old Red Foot tortoise need? Also, in his vivarium which is 4ftx2ftx2ft he has a uvb light which I was told to buy a 12% UVB strip light due to the height of the vivarium. Apparently, the light looses it's values the further away it is??? I did tell the reptile shop that he only needs 5% but they said it's the height?? I'd be grateful for any advise! I live in the UK hence why he is in a vivarium. Thank you!