For the right look in your photos and your studio, nothing beats our Ultra Cool Lights. The revolutionary design of vents and baffles provides superior heat dissipation for cool operation, and the reflectors are engineered for reliably smooth light output. Ultra Cool Lights have universal 3/8" to 5/8" swivel yoke mounts, and porcelain sockets, heavy-duty rocker switches and 10' 3-wire grounded cords. The lights use medium screw base lamps, sold separately.