Thunder &trade; Exclusive 8-Inch SunDyn Double Ended Dual Lamp Reflector with 5 Year Warranty (BULB INCLUDED) "Vent-to-Vent Size: 20" x 31" x 10.5" (L x W x H) / Reflector: 20" x 20" x 10.5" (L x W x H) / Vent: 8 Dual Lamp Bulb Socket. Compatible with Sunlight Ballasts or Thunder Ballast. Retractable front glass panel for easy cleaning and bulb maintenance. Made with European Aluminum. Comes equipped with easy hanger clips. COMPATIBLE with a 1000w Ushio AHS-DE 1000 Opti Red Bulb (BULB INCLUDED).