Enter the power usage rate, run time, and electricity cost into the calculator to determine the grow light cost.

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## Grow Light Cost Formula

The following equation is used to calculate the Grow Light Cost.

GLC = EC*T*P

- Where GLC is the grow light cost per day ($)
- EC is the electricity cost ($/kwh)
- T is the average time of usage per day (hours)
- P is the power usage of the light (kWh)

To calculate the cost of a grow light, multiply the average usage time per day by the power rating of the light, then multiply by the electricity cost.

## What is the Cost to Run A Grow Light?

The cost to run a grow light depends on 3 factors:

- The cost of electricity. This is highly dependent on location and the source of electricity. For example, solar energy would be cheaper than that from the grid.
- The daily run time of the light. The longer the light runs, the more it will cost.
- The power usage per hour of the light. The higher the power usage the greater the cost.

## How to Calculate Grow Light Cost?

Example Problem:

The following example outlines the steps and information needed to calculate Grow Light Cost.

First, determine the cost of electricity. In this example, the cost is $.125 /kWh.

Next, determine the daily run time. For this problem, the light runs for 24 hours a day.

Next, determine the power rating of the light. This grow light has a rating of .445 kWh.

Finally, calculate the grow light cost using the formula above:

GLC = EC*T*P

GLC = .125*24*.445

GLC = $1.33 / day