Incandescent version may only be mounted vertically; compact fluorescent version may be mounted vertically or horizontally . Includes 120 volt, 60 watt or equivalent medium base BT15 halogen lamp, 13 watt 2GX7 base twin tube compact fluorescent lamp (electronic ballast included) or 8 watt, 500 lumen, 2700K LED module. Incandescent version dimmable with standard incandescent dimmer. LED version dimmable with low-voltage electronic dimmer. ADA compliant.