Converting DOT High Mast lights over to LED

One of the best opportunities to save money is to convert Metal Halide and High Pressure Sodium High Mast lights over to LED. A typical high mast light consists of a tall pole, 50-150 tall and contains multiple fixtures attached to the pole, typically 4 to 12. The lower poles may be equipped with 400W Metal Halide or High Pressure Sodium bulbs, the taller poles typically are installed with 1000W Metal Halide or High Pressure Sodium bulbs.

So let’s do some quick savings scenarios, using both new High Mast fixtures as well as a scenario where you retrofit an existing high mast fixture.

In each of these scenarios, we will assume the following:

Cost of electricity: .12 kw/h

Hours of operation: 12 hours a night

Number of days run each year: 365

 

Scenario 1: Retrofitting 400W Metal Halide bulbs with 105W LED Retrofit kits using the existing fixture. 4 lights per pole.

In this scenario, energy reduction is reduced by 350 Watts per fixture. We assume a ballast draw of 55W per fixture for the metal halide fixture.

Savings per pole per year after LED conversion: $746.35

 

Scenario 2: Replacing 1000W Metal Halide fixtures with 400W LED High Mast Fixtures. 6 lights per pole.

In this scenario, energy reduction is reduced by 750 Watts per fixture. We assume a ballast draw of 150W per fixture for the metal halide fixture.

Savings per pole per year after LED conversion: $2365.20

 

Scenario 3: Replacing 1000W Metal Halide fixtures with 400W LED High Mast Fixtures. 12 lights per pole.

In this scenario, energy reduction is reduced by 750 Watts per fixture. We assume a ballast draw of 150W per fixture for the metal halide fixture.

Savings per pole per year after LED conversion: $4730.40

 

Payback Calculation: Converting to LED

Several factors come into play.

  1. The cost of the LED Product
  2. The cost of installation and possibly disposing of the old fixtures.
  3. The rebate to offset the purchase cost and cost of installation
  4. The efficiency of the LED product

The first two are obvious, this is the cost of the product and installation and disposal. Before you move forward, you really need to think about point 3, the rebate. A conversation with the utility company needs to happen, and in this conversation, you will find out what they rebate, how they calculate the rebate, and the different rebate amounts for DLC Premium vs DLC Standard. DLC Premium products are far more efficient than DLC Standard products. To be DLC Premium Qualified, the efficacy of the product has to be above a specific threshold. Purchasing a DLC Premium product assures you of two things: you will consume less energy than a DLC Standard product and possibly create more lumens (assuming they both consume the same amount of watts) and the rebate for the DLC Premium product should be larger. So the more efficient the light, the quicker the payback. The sales engineers of MyLEDLightingGuide can perform a payback analysis for you.

Click Here to View LED High Mast Lighting


2 Comments

  1. all scenarios are metal halide, do you have any with high pressure sodium 1000w thru 150
    and low pressure sodium 55w thru 180w

  2. Hi Michael, the reason we choose Metal Halide and not HPS or LPS is because the quality of light (CRI) is so much higher with Metal Halide than the other two, the effects of converting over to LED is even greater. So we picked what we believe to be the best light source of the HID light sources in our comparison

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