Anyray (5)-Pack 500 Watt T-3 J-Type Halogen R7S Clear 500W Double Ended 500Watt Bulbs 120 Volt 118mm or 4.56 inches Long
Feit Electric 500-Watt EQ T3 Dimmable Bright White Tubular Rough Service Halogen Light Bulb (2-Pack) in the Halogen Light Bulbs department at Lowes.com