Glass Halonix 500W Halogen Tube, Base Type: G4, 220V
500 Watt Warm White T3 Dimmable Halogen Rough Service Light Bulb 2 Pack (BPQ500T3/CL/RS/2) - Halogen Bulbs - Amazon.com
Feit Electric 500-Watt EQ T3 Bright White Recessed Double Contact Dimmable Halogen Light Bulb (2-Pack) in the Tube Light Bulbs department at Lowes.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