Young tortoises housed indoors will require both a source of heat as well as full spectrum lighting. Within the enclosure you should establish a thermal gradient, that is, one end of the tank should be warmer and the other side cooler. This gives the tortoise a range of temperatures from which to choose at any given time. For babies and juveniles, daytime basking temperatures should be around 90 degrees, while larger animals can have basking spots near 100 degrees. In both cases, the side of the cage farthest from the heat source should not exceed 80. Full spectrum UV lighting is a must for maintaining sulcata tortoises. In the wild, they are exposed to unfiltered sunlight, and this light is what allows for the body to synthesize vitamin D3 which is in turned needed for calcium absorption in the gut. In captivity we have bulbs designed specifically for this purpose. Most are in the form of fluorescent tubes, but new bulbs that provide both heat and light (such as Zoo Med’s Powersun) are a great choice for larger animals housed in larger enclosures.