Mounts vertically only. Includes 120 volt, 75 watt or equivalent medium base T8 lamp, 2G11 base 18 watt twin tube compact fluorescent lamp (electronic ballast included) or two 16 watt, 1000 lumen, 2700K LED modules. Incandescent version dimmable with standard incandescent dimmer. LED version dimmable with low-voltage electronic dimmer. ADA compliant.