Full spectrum lighting is essential for most pets to absorb vitamins necessary for healthy growth. Now comes with Zoo Med? Reptisun 5.0 bulbs that are ideal for iguanas, birds, and most other reptiles. Comes in this very affordable, easy to mount combo. Pre drilled holes for mounting available upon request. Dimensions are approximate, prices include installation (please specify if desired)!!! (Notice: at this time, we do not have a guard for the 18?size light). Guard for 24? light sold separately.