Enter the total power usage, average daily time, and the cost of electricity into the calculator to determine the cost per light.

Cost Per Light Formula

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

CL = P/1000*T*365*EC
  • Where CL is the cost per light ($/light/year)
  • P is the power consumption of the lightbulb (watts)
  • T is the average daily usage (hours)
  • EC is the electricity cost ($/kwh)

To calculate the annual cost per light, multiply the average daily usage by the power consumption, then again by 365 and the electricity cost, and finally, divide by 1000.

What is the Average Cost Per Light?

Definition:

The average cost of a light depends on the power consumption, the electricity cost, and the average daily usage of the lightbulb. On average, a lightbulb can cost anywhere from $10.00 – $100.00 per year, depending on how often it is on.

How to Calculate Cost Per Light?

Example Problem:

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

First, determine the power consumption of the lightbulb. In this example, the power consumption is 50watts.

Next, determine the average daily run time. This light bulb is used 10 hours per day.

Next, determine the electricity cost. In this case, the electricity cost is $.40/kWh.

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

CL = P/1000*T*365*EC

CL =50/1000*10*365*.40

CL = $73.00 /year

FAQ

What factors can influence the cost per light?

The cost per light can be influenced by several factors including the power consumption of the lightbulb (watts), the average daily usage (hours), the electricity cost per kWh, and the efficiency of the lightbulb. Additionally, the type of bulb (LED, incandescent, fluorescent) can also affect the overall cost due to differences in energy efficiency.

How can I reduce my cost per light?

To reduce the cost per light, consider using energy-efficient lightbulbs such as LEDs, which consume less power and have a longer lifespan compared to traditional incandescent bulbs. Additionally, reducing the daily usage of lights by turning them off when not needed or using natural light during the day can also help lower costs. Installing dimmers or timers can further optimize energy usage and reduce costs.