I am getting my hermanns tortoise a new 6ft x2ft enclosure. Currently I use an all in one uva/uvb bulb and a Che heat bulb for night time.. Wondering if I should consider a tube uvb now or just add extra light fixture since currently in a 3.5 ft by 2ft enclosure. Just want to make sure he/she will still get proper lighting in a larger home. In the summer I do have an outdoor pen just waiting till weather warms up before going outside.