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You'll need a source of heat that maintains temperatures within the enclosure at a level comfortable for the bearded dragon. Dragons like temperatures between 78 and 88 F (25 to 31 C) during the day, and evening temperatures between 70 and 79 F (21 and 26 C).  Use a series of incandescent lights above the top of the cage. Keep in mind that they'll need to be turned off at night, when another heat source will be necessary, depending on the temperature in the room. Try a heating pad under the cage or a ceramic infrared heater as an evening source of heat. There are reptile-specific incandescent bulbs which emit heat but little visible light; however, these are expensive. For larger enclosures, adjust the room temperature with a thermostat or space heater. Always include a fire alarm in a room where light or other heat sources are in operation. Beardies like a temperature gradient in their habitat, allowing them to move between warmer and cooler spaces. The secondary heat source provides them with a spot where they can bask. This area should cover about 25-30 percent of the total enclosure surface, with a temperature of about 95-100 F (35-38 C). You can use a special basking light, or opt for a simple 30-75 watt incandescent bulb in a ceramic base. The source should be securely mounted where the animal cannot touch it.  Never use hot rocks as a heat source! Note that baby bearded dragons in a smaller cage space will need a lower wattage, otherwise the enclosure may become too hot.  Any temperatures above 110 F (43 C) are not recommended, but within a few degrees of these basking temperatures will be sufficient. One thermometer on the "hot side" and one on the "cool side" will make sure that your temperatures are in the correct range. Bearded dragons require ultraviolet light in order to produce Vitamin D, which in turn aids calcium absorption; insufficiency can lead to metabolic bone disease. You can use either fluorescent or mercury vapor bulbs; the former need to be replaced approximately every six months, since UVB output diminishes over time. They should have about 12 to 14 hours per day of exposure.  Make sure the fluorescent bulb has at least 5 percent UVB (check the packaging for these specifications). Look for light strips that cover the length of the enclosure. Consider reptile-specific black lights in the 290-320 nanometer range. (Note that these are not the same as plant-grow lights or psychedelic black lights, neither of which produces UVB rays.) You can choose bulbs that emit both white light and UVB, or UVB only. Ideally, the UVB light source should be about 10-12 in (25.4-30.5 cm) from wherever the bearded dragon spends most of its time (such as the basking site) to ensure adequate exposure. It should be no farther than 18 in (45.7 cm) away. Keep in mind that UVB rays do not pass through glass. Your UVB source should be above the mesh top of the enclosure, and the mesh should not be too fine. The sun is the best source of UVB rays. On sunny days when the temperatures are in the appropriate range (see Part 3, Step 1, above), place your beardie outside in a secure screen or wire cage with a locking door. Remember to provide some shade and hiding spaces, as well.

Summary:
Provide a primary heat source. Include a secondary heat source. Provide UVB lighting.