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Fulham WorkHorse 6 Electronic Instant Start Ballast 277V, Long Case

SKU: WH6-277-L | Ordering Code: WH6-277-L  | UPC: 872180100838

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Product Highlights

  • Ignites up to four 4-Pin/T5/T8/T8HO/T10/T12/T12HO/Circline lamps

Fulham Brand WorkHorse 6 Electronic Ballast, 277 Volt, with Leads. Ten ballasts operate 132 lamps in 860 combinations.  Ballast Lamp Starting Mode:  Instant Start.

WH6-277-L Fluorescent Ballast Ignites:

  • Circline:  One 20W - 40W, Two 20W - 22W, 40W 
  • T5 Circline:  One 22W - 40W, Two 22W - 40W
  • T5 Linear:  Three F4 - F6, F14 - F35. Four F4 - F35
  • T5 HO:  One F39HO  - F80 HO, Two F24HO - F54HO, Three F24HO - F39HO, Four F24HO
  • T8 Linear:  One F14, Two F13 - F15, F18, F30, F58 - F70, Two F13 - F70, Three F13 - F40, Four F15 - F17, F25, F32
  • T8HO:  One F48HO - F72HO, Two F48HO - F60HO, Three F72HO
  • T10 Linear:  One F40, Two F40
  • T12 Linear:  One F14, One F20 - F96, Two F14 - F96, Three F15, Four F15
  • T12HO:  One F18HO - F96HO
  • Twin:  One 13W - 55W, Two 5W - 50W, Three 5W - 11W, Four 5W - 11W
  • Flat Quad:  One 18W - 36W, Two 18W - 36W
  • Quad:  One 26W, Two 10W, Two 18W - 26W, Three 10W - 18W, Four 10W - 13W
  • Triple:  One 28W - 38W, Two 10W - 38W, Three 10W - 21W, Four 10W - 16W 
  • 2-D:  One 28W - 38W, Two 10W - 38W, Three 10W - 21W, Four 10W - 16W
Full Specs



Input Volts


Input Watts

24 - 63

Number of Lamps


Ballast Factor

The percentage of a lamp's rated lumen output that can be expected when operated on a specific commercially available ballast. For example, a ballast with a ballast factor of 0.93 will result in the lamps emitting 93% of their rated lumen output. A ballast with a lower ballast factor results in less light output and also generally consumes less power.
Ballast Factor
0.79 - 1.12

Ballast Type

Magnetic ballasts are a legacy technology and use inductance to transform the line voltage to the voltage required to "fire" or excite the gasses in a lamp. Electronic ballasts use a variety of starting methods, and are more efficient than magnetic ballasts in converting input power to the proper lamp power and operate fluorescent lamps at higher frequencies, resulting in an overall lamp-ballast system – increasing efficacy 15% to 20% over a magnetic equivalent.
Ballast Type

Length (in)

Also referred to as "Maximum Overall Length" (MOL). For light bulbs, it measures the length of a light bulb, from the top of the bulb to the bottom of the base or pins and is typically expressed in inches. For light fixtures and ballasts, it applies to the total horizontal length of the item.
Length (in)

Width (in)

For fixtures and ballasts, width is the measurement of the total horizontal distance from left to right of the product in inches.
Width (in)

Height (in)

For ballasts and fixtures, height is the measurement of total vertical distance from the top of the product to the bottom expressed in inches.
Height (in)

Power Factor

0.87 - 0.96

Total Harmonic Distortion (THD)

Total harmonic distortion, or THD, is the measure of how much a ballast can distort the waveform of that building’s power supply and interfere with other equipment. Electronic ballasts today are rated at less than 20 percent, 15 percent, or less than 10 percent THD. The magnetic ballast is rated in the 20 to 28 percent range. The lower the THD the better and more efficient the ballast, and the less likely it is to interfere with other electronic equipment.
Total Harmonic Distortion (THD)
38.6% - 44.1%

Lamps by Wattage

1x13W-55W, 1x14W, 1x58W-96W, 2x05W-96W, 3x04W-40W, 4x04W-35W


5 years

Ballast Lamp Type

The type of bulb the ballast can fire.
Ballast Lamp Type

Maximum Current (Amps)

The maximum amount of Amps that a ballast can hold.
Maximum Current (Amps)

Maximum Load (Watts)

The maximum power that a product can handle.
Maximum Load (Watts)

Start Type

For Ballasts, indicates the method the ballast uses to start its bulbs. HID ballasts can be Probe or Pulse start. Fluorescent ballasts can be Rapid, Instant or Programmed start. For HID and Fluorescent bulbs, indicates the start-type of ballast that the bulb will work with.
Start Type
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