Westinghouse 0497900 300 Watt Halogen T3 Double-Ended Rough Service Cl – ohBulbs.com
Feit Electric 300-Watt Bright White T3 R7 Base Dimmable Halogen Light Bulb (2-Pack) BPQ300T3/CL/2/HDRP - The Home Depot
Simba Lighting® Halogen R7s 118mm 120V 300W T3 J Type Double Ended Bulbs, 5-Pack
Rowrun 30W R7S J118 T3 LED Bulb Daylight White R7S Base 118mm 300W Equivalent Double Ended led Replacement for Halogen Workshop Lighting Bulb 6000K Non Dimmable (1) - - Amazon.com