Each fitter glassware can use a 60 w. 120 v. incandescent bulb producing 950 lumens or a 19 w. 120 v fluorescent bulb producing 1200 lumens. The fluorescent bulb produces about 4 times more light per watt than an incandescent bulb. Bulbs are not included with the DiskFan® but must be purchased at a local store.