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  • Brand: Keystone
  • Lamp Type: F28T5/HE, F21T5/HE or F14T5/HE
  • Number Of Lamps Controlled: 1, 2, 3 or 4
  • Voltage: 120-277
  • Starting Method: Program
  • Power Factor: High
  • Ballast Factor: Normal
  • Min Start Temp: -0 Degree F, -18 Degree C
  • Warranty: 5 Years
5 Year Warranty UL Listed



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The Keystone F28T5/HE, F21T5/HE or F14T5/HE electronic ballast from Warehouse-Lighting can accommodate one, two, three or four lamps. Weighing 2.21 pounds this is a dependable ballast with a high power factor and a normal ballast factor. It has a minimum start temperature of 0 degrees Fahrenheit.

This is a program-start ballast, which means that it’s easier on lamps than instant-start ballasts. That’s because it preheats the cathodes at low voltage, decreasing cathode wear. Although program-start ballasts are less energy efficient than instant-start ballasts, they make sense for situations in which lamps will be frequently turned on and off, because lamps in program-start fixtures will last longer under these circumstances.

The manufacturer of this 120-277V ballast, Keystone Technologies, was founded by a World War II veteran and has been in business in Pennsylvania for more than 70 years. Known for its commitment to quality, Keystone covers this ballast with a five-year warranty.


  • Length: 18.55”
  • Width: 1.31”
  • Height: 1.03”
  • Mounting: 17.53”
  • Weight: 2.21 lbs

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