10 x Linear Tungsten Halogen Security 100w 200w 300w 500W R7S 118mm 78mm 240v | eBay
PHILIPS 500W 120V T3 R7s Double Ended Linear Light Bulb – BulbAmerica
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
R7s 500W MAX | Heat Shield inside of a flood lamp. | Danny Ryder | Flickr
Simba Lighting® Halogen R7s 118mm 120V 500W T3 J Type Double Ended Bulbs, 5-Pack