There are several full spectrum fluorescent light bulbs on the market. Most claim that they duplicate the sun's light spectrum, however it is unlikely that any can achieve the intensity of ultraviolet light emitted by the sun. There is no scientific research supporting the assumption that these bulbs are beneficial, however there use is recommended since there is some antidotal evidence that they provide psychological benefits to the lizards. Most desert species are adapted to live without free water. Uromastyx ornatus comes from the Sinai Peninsula where it rains less than 2 inches per year.
Many species obtain moisture from the food they consume.
There is evidence that some species, such as the Australian Moloch and North American horned lizards, collect morning dew on their scales which is then channeled toward the mouth. Many herpetoculturist soak their Uromastyx aegypticus in water and claim that the animal swells as it absorbs water. Whether the animal is actually filling up with water or only filling it's body cavity with air is unknown. Considering that this is a desert species, soaking in water seems inconsistent with adaptations to arid conditions and could lead to respiratory infections if the animal does not thoroughly dry after soaking. Water can be provided infrequently in a bowl.