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  • Brand: Keystone
  • Lamp Type: F54T5/HO, F54T5HO/ES(49W), FT55W/2G11, FT50W/2G11, FT36/2G11 or F58T8
  • Number Of Lamps Controlled: 1, 2, 3 or 4
  • Voltage: 120 or 277
  • Starting Method: Program
  • Power Factor: High
  • Ballast Factor: Normal
  • Min Start Temp: -20°F, -29°C
  • 5 Year Mfr. Warranty
5 Year Mfr. Warranty UL Listed



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The Keystone F54T5/HO, FT55W/2G11, FT36/39W/2G11 or F58T8 electronic ballast from Warehouse-Lighting powers one, two, three or four lamps. This 120-277V ballast has a high power factor and a normal ballast factor. Its minimum start temperature is -20 degrees Fahrenheit.

Founded by a veteran returning home after World War II, Keystone has been in business in Pennsylvania for 70 years and stands behind this reliable product with a five-year warranty, with no questions asked. This ballast is program start, which means it’s ideal for applications in which lights will be turned on and off frequently. Because program-start ballasts warm up the cathodes, lamps last longer compared to lamps controlled by ballasts using instant start.

Usually shipping in three to five business days, the Keystone F54T5/HO, F54T5HO/ES(49W), FT55W/2G11, FT50W/2G11, FT36/2G11 or F58T8 electronic ballast is available from Warehouse-Lighting with volume discounts. That means that the more you buy, the more you save.

If you have any questions, just call our experts here at Warehouse-Lighting at our toll-free number or use our instant-chat feature for quick answers.


  • Length: 16.70”
  • Width: 1.70”
  • Height: 1.18”
  • Mounting: 16.09”
  • Case Style: L10

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