Fluker's Sun Dome is specifically designed to accommodate larger or longer bulbs, such as Fluker's Sun-Glow and Sun Spot bulbs. The dome extends beyond the face of the lamp, so longer bulbs are contained within the fixture. The polished aluminum surface inside the dome increases UVB and UVA output compared to domes with white interior surfaces. This appliance has a POLARIZED plug (one blade is wider than the other). To reduce the risk of electric shock, this plug is intended to fit in a polarized outlet only one way. If the plug does not fit in the outlet, reverse the plug. If the plug still does not fit, contact a qualified electrician. Do not modify the plug in any way.