taht is acually a 20 watt light that gives off the same amount of light as a 75 watt.
I have that and i would only use for lighting since it really doesn't give off a whole lot of uvb. it gives off tons of light and plants realy like it. if you have a small tank like a 10 gallon or 20 it works well for anoles and frogs and things but not really good for chams.
and i know they cost like twenty dallors so you could use it for a while just make sure that your chams can get acual sun light some time in the year or get a higher uvb output bulb