It is really best not to use a light as a heat source. You can buy an under the tank (UTH) heater of some type. Your pet store should sell them. You will also need a thermostat to regulate the UTH. This starter kit that you bought is for general reptile use and is not specifically designed for snakes. It is hard to regulate humidity in a glass tank although you can do so by covering the top of the tank with aluminum foil or something if if has a screen top. You would have done better in my opinion to have bought a Sterelite plastic tub at Target instead of the glass tank. My first reptile was a leopard gecko and the pet store where I bought her sold me an expensive inappropriate set up t go with it.There are caresheets on this site to help you and people will be glad to answer any questions that you may have. You will have to no doubt fiddle with your enclosure until you get it right. Keep posting as you go.