Home > Industrial Light Fixtures > What is the Wattage of a 4 Foot 6 Lamp T8 Fixture?

What is the Wattage of a 4 Foot 6 Lamp T8 Fixture?

Commonly used as industrial lighting, a 4 foot 6 lamp T8 fixture provides an excellent option for illuminating a large area. In this fixture, the T8 bulbs are 1 inch in diameter, 4 feet in length and the fixture contains a total of 6 bulbs. This type of lighting is best used in extremely large spaces with high ceilings that must be sufficiently illuminated such as:

  • Schools
  • Stores
  • Warehouses
  • Gymnasiums
  • Factories
  • Garages
  • Workspaces

When selecting lighting for such a large space, energy efficiency is an important consideration. In this 4 Foot 6 Lamp T8 fixture, the wattage per lamp is 32 watts and for the fixture as a whole 226 watts. To understand what this means and how it relates to energy costs, we need to first understand a few terms:

  • Wattage: a measurement of how much power the lamp uses.
  • Kilowatt-hour (kWh): a unit of energy that represents the use of 1000 watts of power for 1 hour
  • Cost per kWh: the amount your energy provider charges you for 1 kWh – this rate is typically found on your bill

Now we can determine the cost of running a light fixture using this simple method:

  • Multiply the total wattage (note that 1000W=1kW) by the time the lamp is used to get kilowatt-hours (kWh)
  • Multiply the kWh by the cost per kilowatt hour

In this fixture, the total wattage is 226 watts. Let’s say that you use this one fixture for 10 hours a day, giving you a daily energy use of 2.26 kilowatt-hours. If you pay 15 cents per kWh to your electric provider, each day you would pay 33.9 cents to use this fixture.


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