Can be used on a screen top or with the rimless turtle kit light rails.With sockets for both a g9 mini compact fluorescent bulb and mini halogen bulbs in a slim, low profile design.The min g9 uvb/heat dome is the most energy efficient and stylish reptile fixture on the market.Contains built in reflectors to increase heat and uvb protecyion.Bulbs sold separately.The zilla mini g9 uvb/heat dome is the most cutting edge technology in reptile lighting.