whats the model of the tube that came with it? Zilla does make good uv bulbs. If its just a full spectrum or a 1.0-2.0 made for a gecko then you will need to go buy a 5.0 8.0 10.0.
Edit: zilla still had bad tropical 25 bulbs going out in 2011. If you happen to get one you will have those bad ones that put out alot of uvc that are the ones harming the eyes. Just axe the bulb and get a repitsun 5.0, a reptiglo 8.0, or if its a 3-4ft tall tank, a repisun 10.0.