How To Calculate Watts: 400 Metal Halide vs. T-5 High Bay Fluorescent
Which Fixture is More Efficient? 400 Watt Metal Halide or T-5 High Bay Fluorescent?
Read On To Learn More About How To Calculate Watts:
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 458 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.
458 Watts - 200 Watts = 258 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
It Costs How Much?
Let's assume you have the following:
We are going use just 1 fixture for this example (Fixture Quantity)
458 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)
How much does the 400 Watt MH cost annually?
1(Fixtures) x 458 (Watts Each) = 458 Watts
458 Watts / 1000 = .458 kw
.458 kw x 2000 hrs per year = 916 kwh (Kilowatt) Annually
916 kwh x .10 = $91.60 to operate 1 400 Watt Metal Halide for 1 Year
How much does it cost annually to operate 1 - T-5 High Bay?
1 (Fixtures) x 200 (Watts Each) = 200 Watts
200 Watts / 1,000 = .20 Kw (Kilowatt)
.20 Kw x 2000 hrs per year = 400 kwh (Kilowatt Hour)
400 kwh x .10 = $40 to operate 1 T-5 High Bay Fluorescent
"Watt's" the difference? $51.60 Annual Savings
458 Watts - 200 Watts = 258 Watts
-Or-
$91.60 - $ 40 = $51.60 In Annual Savings or 56% Savings
Multiply By The Number of Fixtures
If you have 100-400 Watt Metal Halides, then you would save $5160 per year if you ugraded to the T-5.
Have 500 of them?
Then your annual savings would be $25,800.
Can You See The Correlation?
If you just know the wattage of your existing fixture and the wattage of the new fixture, you can determine your annual energy savings:
458 Watts - 200 Watts = 258 Watts Difference or 56% Less Watts
$91.60 - $ 40 = $51.60 In Annual Savings or 56% Savings
Want To Learn More About Energy Efficiency?
Energy efficiency calcualtions and terminology can sometimes be confusing. We created a Free E-book to help you determine the best investments for your eneryg efficiency dollars. To learn more, see the button below;
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