• Energy Calculator
  • Watts Per Sq. Ft.
  • Lighting Layout
  • Fixture Replacement
  • Dimming Watts
  • Cost of Waiting
  • Simple Life Cycle

  • Basic Energy Calculator

    Calculate energy savings by relamping your lighting system.
    Also calculate the return on investment of the new system.

    Fill in all the fields and click "calculate".
    Your results will display below.

    * Required
    * Quantity of fixtures:
    * Average operating hours per year:
    * Cost per kilowatt hour: $
    * Watts (per fixture) used in existing system:
    * Watts (per fixture) used in new system:
    Cost to upgrade each fixture*: $
    click to calculate
    Results
    Energy Savings (with proposed system)
    Cost of Electricity
    Current system: per year
    Proposed system: per year
    Each fixture: per year
    Total: per year
    * This cost should include the lamp, ballast, and labor required to replace the fixture. You may want to subtract any costs that would have been incurred with the current system.

  • Watts Per Square Foot Calculator

    Compare the watts per square foot of an existing system to a proposed system.

    Fill in all the fields and click "calculate".
    Your results will display below.

    * Required
    * Square footage of area to be lit:

    Lighting System 1
    * Number of fixtures:
    * Watts used per fixture:

    Lighting System 2
    * Number of fixtures:
    * Watts used per fixture:
    click to calculate
    Results
    Lighting System 1 Lighting System 2
    Watts per square foot:
    Total lighting system load:

  • Lighting Layout Estimator

    Estimate the number of fixtures needed to light an area to a specified light level.

    Enter the following information and click "calculate."
    Your results will display below.

    * Required
    * Square footage of area to be lit:
    * Desired footcandles:
    * Average number of hours on per year:
    * Watts per fixture:
    * Number of lamps per fixture:
    * Rated mean lumen per lamp:
    * Ballast factor (BF):
    * Coefficient of Utilization (CU):
    * Your electric cost per kilowatt hour: $
    click to calculate
    Results
    Estimated number of fixtures needed:
    Estimated number of lamps needed:
    Estimated fixture spacing:
    Watts per square foot: watts
    Total power load: kW
    Energy cost per year:
    Note: This estimator does not include Light Loss Factors (LLF) from ambient temperature, voltage, dust, and tarnishing.

  • Fixture Replacement Estimator

    Replacing your current lamps? Use this calculator to estimate the number of fixtures you'll need with replacement lamps. Also compare the difference in the amount of light between your current lamp and replacement lamp.

    Enter the following information and click "calculate."
    Your results will display below.

    * Required
    * Number of existing fixtures:

    Current Lamp
    * Number of lamps per fixture:
    * Lamp mean lumens:
    * Ballast factor (BF):
    * Coefficient of Utilization (CU):

    Replacement Lamp
    * Number of lamps per fixture:
    * Lamp mean lumens:
    * Ballast factor (BF):
    * Coefficient of Utilization (CU):
    click to calculate
    Results
    The replacement lamp...
    Will result in a change in average light level.
    Will require fixtures to maintain the same average light level.

    Compare amount of light:
    Current Lamp Replacement Lamp
    Source mean lumens per fixture:
    Usable mean lumens per fixture:

  • Dimming System Watts Estimator

    Can a dimming system help you save on energy costs? Use this calculator to estimate the wattage, energy reduction and cost savings generated by using a dimming system.

    Enter the following information and click "calculate."
    Your results will display below.

    * Required
    * Electric cost per kilowatt hour: $
    * Number of fixtures:
    * Watts per fixture at full power:

    Percent of light at each setting
    Full power: 100 %
    * Dimmer setting 1: %
    Dimmer setting 2: %

    Percent of time used at each setting
    (must equal 100%)
    * Full power: %
    * Dimmer setting 1: %
    Dimmer setting 2: %
    click to calculate
    Results
    Overall Equivalent Wattage:
    At Full Power With Dimming
    Effective fixture watts:
    Relative power consumption: 100%
    Total power load:
    Energy Reduction With Dimming:
    Cost Savings:

  • Cost of Waiting Estimator

    Compare the cost of electricity for your current and proposed lighting
    systems, and estimate the cost of waiting to upgrade to the new system.

    Enter the following information and click "calculate."
    Your results will display below.

    * Required
    * Number of fixtures:
    * Average number of hours on per year:
    * Your electric cost per kilowatt hour: $
    * Watts per fixture used in current system:
    * Watts per fixture used in proposed system:
    click to calculate
    Results
    Cost of Electricity
    Current system: per year
    Proposed system: per year
    The cost of waiting to upgrade your lighting system is /month and /year.

  • Simple Life-Cycle Cost Estimator

    Compare the life-cycle costs for two different lamps.

    Enter the following information and click "calculate."
    Your results will display below.

    * Required
    * Average number of hours on per year:
    * Electric cost per kilowatt hour:

    Lamp 1
    Lamp name:
    * Watts (fixture watts/# of lamps):
    * Cost (including disposal cost): $
    * Life in hours:
    * Cost of labor to replace lamp: $
    Mean lumens:

    Lamp 2
    Lamp name:
    * Watts (fixture watts/# of lamps):
    * Cost (including disposal cost): $
    * Life in hours:
    * Cost of labor to replace lamp: $
    Mean lumens:
    click to calculate
    Results
    Lamp 1 Lamp 2
    Lamp name:
    Cost over lamp life:
    Cost per 1,000 hours:
    Cost per year:
    Cost per million lumen hours:
    Savings with Lamp 2: /year
    * If you are comparing lamps with significantly different light output, the cost per year may have a greater difference. To get a more accurate representation of the cost of light, look at the cost per million lumen hours.