An Exo Terra Solar Glo UV/Heat, 100 W Flood, Bulb is recommended during the day for reptiles.
Unlike the fluorescent tubes, this bulb provides UV at the similar overall output level as the sun.
It is also a source of both UV and heat, and will last for a full year.
The bulb needs to be in a clamp lamp with a ceramic fixture to prevent melting.
The fixture should be carefully secured to avoid being bumped and breaking the filament or starting a fire.
A red heat bulb can be used at night to prevent nighttime temperature drops.
UV is crucial for vitamin D, which allows the proper absorption of calcium.