Westinghouse Halogen Bulb 500 W 9500 Lumens T3 Clear Carded / 2 - Amazon.com
Feit Electric 500-Watt Warm White (3000K) T3 R7 Double-Ended Tube Dimmable Halogen Rough Service Light Bulb (48-Pack) BPQ500T3/CL/RS/2/24 - The Home Depot
Philips Halogen 500-Watt T3 Work and Security Light Bulb, Clear Bright White, Dimmable, Double Ended Base (2-Pack) - Walmart.com
Amazon.com: 500 WATT Halogen Bulbs
500 Watt Halogen Exposure Light
GE 500-Watt Halogen T3 Light Bulb - 19382 | Blain's Farm & Fleet
Utilitech 500-Watt EQ T3 Bright White Recessed Double Contact Halogen Light Bulb (6-Pack) in the Tube Light Bulbs department at Lowes.com