GE Halogen Light Bulb, T2.5 Tube Light, R7 Base, 300 Watt, For Work, Security and Landscape Lights (1 Pack) - - 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
Feit Electric 150-Watt EQ T3 Dimmable Bright White Tubular Landscape Halogen Light Bulb (2-Pack) in the Halogen Light Bulbs department at Lowes.com