Well first off I just want to say I am certainly not an expert, just well researched. But snakes unlike lizards get all their needs from thier food. lizards need help from lights and proper Husbandry to thrive. In my experience you should have a incandescent (white)light basking area that contains UVA(basically visable light to your lizard, not hummans). Now with UVB we have a dilema. Some say that with proper nutrition and husbandry theres no need for the UVB, which certainly may be true. Others say its essential. A UVB or flourescent tube bulb can help to synthesis the vitamin D3 which fights MBD. Now, really its up to you. If your not the most experienced keeper, invest in UVB. If anything it will do no harm. However, stay away from UVB 10.0 bulbs for the time being. Theres been some problems with those. For a savannah maybe use an 8.0 rated bulb. As for your red incandescent bulb, those are usually used only to maintain overnight temps above 70 -75 degrees. Sorry for the length.