I am upgrading my chameleon's cage to a 18x18x36 in a cage and I know I need to upgrade his light as well. For some reason I am not able to find a pet store near me that has the Zilla brand tropical 25-watt t8 light fixture and bulb, all they carry is the dessert 50-watt t8 bulb. What concerns me is that the dessert bulb specifically says for dessert dwellers, not for my tropical Chameleon. What should I get the best uvb bulbs for chameleons? What is the quickest way to get the correct bulb? And would the dessert 50-watt t8 be too much even for the size of my cage?