Uses 4 bulbs, not included. Includes 6 foot suspension chain. The light brooder has a wafer thermostat which automatically controls two of the four lamps. This thermostat can be adjusted to automatically turn off two of the four lamps after the brooder house has reached a desired temperature. This not only eliminates unnecessary use of the four lamps, but also prolongs the longevity of the unit as well as the bulbs. The lamps will again be activated when the temperature drops below the desired setting.