Lighting Layout Toolkit


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*: $
  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.

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: $
  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):  
  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:  

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:  
  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:  
  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.