Thursday, July 14, 2016

Industrial LED Lights - How Much can you save?

So when you convert from Metal Halide or High Pressure Sodium to Industrial LED Lights, how can you calculate the savings. Here is a quick guide to help you sort it out.

How can you calculate the savings when you convert to LED?

Three important factors to consider
  1. Hours On. How many hours per year are your lights turned on? The higher it is, the larger the payback. If your lights are turned on 12 hours a day / 365 days a year, that translates into 4,380 hours per year. If your lights are always on, that's 8760 hours per year.
  2. Electricity Cost. Your utility charges you a rate, adds in their fees and send you a bill. To calculate your "real" rate with all fees added, take the total amount charged and divide it by the kilowatt hours you used.
  3. Rebates? This is the rebate your utility might give you. Some utility rebates are generous. Some not so. For new Industrial LED Lights and LED retrofit kits, there may be rebates available for DLC Qualified Products.
So now you have the 3 factors, 1 and 2 will be used to calculate the savings. Let's look at this scenario. Say you have (100) 400W High Pressure Sodium Area Fixtures, like a flood light. They are on 12 hours a night 365 days a year. The cost of electricity is .12 kw/h.

Your Current Lights consume...
  • Each light consumes 455W (55W extra by the ballast)
  • The watts consumed each day is: 455 X 12 = 5,460 watts per day per fixture
  • Convert to kilowatts by dividing by 1000 = 5.46 kw
  • In 1 year, 5.46 X 365 = 1992.9 kw used per fixture
  • Multiply that by your utility rate 1992.9 X .12 = $239.14 per fixture per year
  • If you have 100 fixtures, your cost is $23,914.00
LED Lights consume...
  • Using a 105W LED retrofit kit, each kit consumes 105W
  • The watts consumed each day is: 105 X 12 = 1,260 watts per day per fixture
  • Convert to kilowatts by dividing by 1000 = 1.26 kw
  • In 1 year, 1.26 X 365 = 459.9 kw used per fixture
  • Multiply that by your utility rate 459.9 X .12 = $55.18 per fixture per year
  • If you have 100 fixtures, you cost is $5,188.00.
    You will save $18,726 per year on these 100 lights.

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