How To Calculate T5 vs 400 Watt Metal Halide High Bay Wattage
Difference in Wattage: 400 Watt MH to T-5 High Bay
Calculating the cost benefits between a 400 Watt MH compared to a T-5 High Bay Fluorescent is a relatively simple calculation. Calculating energy efficiency is actually simple subtraction problem.
Looking at the 2 different fixtures above, we have to find the rated wattage of each fixture.
A 400 Watt Metal Halide is rated at 456 Watts.
A 4 lamp T-5 High Bay (Depending On Manufacturer) is right around 200 Watts.
Now that we have that, we can do the math.
456 Watts - 200 Watts = 256 Watts Difference or 56% Less Watts.
With this information we can now determine how much each of the fixtures will cost us annually.
How To Calculate Kilowatt Hour (kwh)
A watt is only part of the calculation when figuring out how much your fixture is costing you. But in order to show you how a watt fits in, we have to do a little more complicated math.
By utilizing the wattages between the 2 fixtures, we can determine the cost difference between the 400 Watt MH and the T-5. This will help you to understand how to determine the kwh.
Here is the equation we need to use in order to do the math:
Fixture Quantity x Fixture Wattage = Total Watts.
Total Watts / 1000 = Kilowatts.
Kilowatts x (Hours of Usage) = Kilowatt/Hr.
Kilowatt/Hr x (Cost of Energy) = Annual Cost.
How Much Does It Cost?
Let's assume you have the following:
We are going use just 10 fixtures for this example (Fixture Quantity)
456 Watt Fixture (Fixture Wattage for Each) - or -
200 Watt Fixture (Fixture Wattage for Each)
2000 Hours (Hours of Usage)
$.10 Per Kilowatt/Hr (Average Energy Rate Charged)
Annual Cost of the 400 Watt MH cost?
10(Fixtures) x 456 (Watts Each) = 4560 Watts.
4560 Watts / 1000 = 4.56 kw.
4.56 kw x 2000 hrs per year = 9120 kwh (Kilowatt) Annually.
9120 kwh x .10 = $912.00 to operate 10, 400 Watt Metal Halide for 1 Year
Annual Cost of the T5?
10 (Fixtures) x 200 (Watts Each) = 2000 Watts.
2000 Watts / 1,000 = 2.0 Kw (Kilowatt).
2.0 Kw x 2000 hrs per year = 4000 kwh (Kilowatt Hour).
4000 kwh x .10 = $400 to operate 10 T-5 High Bay Fluorescent
What's the Difference?
$51.60 Per Fixture Annual Savings
456 Watts - 200 Watts = 256 Watts.
-Or-
$912 - $ 400 = $512 In Annual Savings (PER FIXTURE) or 56% Savings.
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