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
Light Bulb 120V 500W 500 Watt J Type T3 R7S 118mm Double Ended 4.6 F | eBay
Satco|Satco Part # S2228 - Satco|Satco 500-Watt T3 Double Ended Base Halogen Quartz Light Bulb - Halogen Light Bulbs - Home Depot Pro