Two possibly three. What type of cham are you getting? age? You will probably need 2 lights for sure. The first one will be a reptisun 5.0 fluorescent tube light ( length of tube depends on enclosure size but prob 18" or 24" will do) , this light provides your cham with the UV light it needs to live, this light also needs to be replaced approx every 9 months, make sure you have some vines/perch approx 6" under the UV light. For a basking bulb you can just use a normal household incandescent bulb in a dome ( wattage depends on desired temp but usually at 40-75 watt works good. you can adjust the heat by adjusting the height of the dome, it is not a good idea to keep the dome right on the screen cage because your cham could be burned by it. If you are keeping live plants in your enclosure you may want but don't need to provide a grow light (6500k fluorescent tube) for them to help them thrive. Hope this helps ya out a bit.