The 26" linear 2 & 3 port Fast Jack canopy mounts to a standard 4" electrical box with plaster ring or an octagon box. Maximum 75 watt load per port (total of 150 watts for halogen) or 40 watt load per port (total of 80 watts for LED). Halogen version is dimmable with electronic low voltage dimmer. LED dimming range varies: reference corresponding fixture specification sheets, at www.edgelighting.com, for dimming details. *LED version can also be used with maximum of 50 watt halogen load per port.