Enter the number of hours per day the lights are used.

Enter the number of days the lights are used in a year.

The total number of operating hours per year, the product of daily operation and yearly operation.

This field is not editable.

Select the starts according to application. This selection will affect the life of a fluorescent tube. The occupancy sensor selection will result in the greatest reduction of expected life. Note that LED expected life does not change.

Select the applicable environment for the fixtures. Temperature will affect the life of a fluorescent tube, cold environment reduces expected life. Note that LED expected life does not change.

Enter the total number of tubes (not fixtures) for the project.

Enter the cost of electricity for your area. This will be the initial cost. Keep in mind that most utilities have separate rates for residential, commercial, and industrial.

Enter the projected inflation rate for electricity in your area. Electricity costs typically increase at a rate higher than inflation.

The general inflation rate will be used to project the future cost of fluorescent tubes and disposal fees. The cost of LED tubes is conservatively assumed to remain flat.

Select the fluorescent tube model to compare to the EverLED TR replacement tube.

The rated watts of the LED tube or fluorescent tube. This is the value stamped on the tube by the manufacturer.

The calculated watts the tube will consume. The number here is estimated based on tests conducted by LEDdynamics using a standard fluorescent fixture with a ballast factor of 0.8.

The actual tube watts is automatically updated upon tube selection. You may enter a different number based on your own tests and ballast factor.

Both LED and fluorescent tubes generate heat. The estimated values are based on a percentage of the actual tube power consumption. The number entered here will be used to calculate the cost of heat removal for the building.

The expected life for fluorescent tubes is estimated based on manufacturer's data, number of starts, fixture efficiency and environmental factors. The value for fluorescent tube life is highly variable. LED replacement tubes have an estimated life of ten years, with much less variability in typical applications.

Enter the initial part cost. The future cost of fluorescent tubes will be calculated using the inflation rate. LED replacement tubes are conservatively projected to remain flat. Please contact LEDdynamics for quantity pricing on the EverLED TR replacement tubes.

Fluorescent tubes contain both mercury and phosphor powder, both hazardous substances that require proper disposal. Disposal fees for fluorescent tubes vary according to location.

The EverLED TR tubes do not contain mercury, phosphor powder, or lead resulting in no incremental disposal fee.

The estimated labor cost per tube is calculated based on the information entered in the labor calculation section. Changing the values in the labor calculation section will adjust this number.

Requests for maintenance are often part of the maintenance procedures. This field quantifies the time needed for work notification, correspondence, or other initial procedures. This task is typically performed by one person.

Use this field to enter time used in processing work orders, bill of materials, and purchasing. This task is typically performed by one person.

Enter time used for scheduling the maintenance plans. This may include time on the phone arranging maintenance dates, checking on parts delivery, or other time management functions. This task is typically performed by one person.

Enter the time to assemble all materials, supplies, and tools. This task is typically performed by one person.

Enter time spent traveling to and from location where the maintenance will be performed. This task may involve more than one person. Multiply the time by the number of persons in the crew.

Enter the estimated time on site required to change the lamp. Include the time it takes to remove the tube, clean the fixture internals, and replace the tube. This task may involve more than one person. Multiply the time per tube by the number of persons in the crew.

Enter the estimated time for final cleanup at the site. The time to gather the replaced tube, tools, vacuuming, and etc. This task may involve more than one person. Multiply the time by the number of persons in the crew.

Enter the time used in processing the return of the changeout materials, tool storage, and the time used in any disposal of materials.

Do not include the transit time back. Transit is estimated in the transit field. Do not include the cost of disposal, disposal costs are estimated in the tube information section.

The total man hours will be calculated based upon the sum of the above input.

Enter the initial labor rate per person, including all costs such as wages, health insurance, unemployment insurance, worker's compensation insurance, and other benefits. This value includes projected labor cost increases using the projected labor rate rise.

Enter the expected rate of increase for labor costs.

This value is the product of total hours to change a tube and the fully loaded labor rate.

Check if you want to include the initial investment in LED replacement tubes to determine the ROI. The initial LED replacement tube investment will appear in the first line of the Savings Chart.

Check if the cost of removing the heat generated by lamps should be included with the calculation.

Typically the building's air conditioning system will remove the heat generated by the light fixtures.

The COP (coefficient of performance) is used to calculate the electric power required to operate the air conditioning system. Selecting a COP of 4 means that the air conditioning system will remove 4 watts of heat for every watt of electric power consumed. Most air conditioning systems operate with a COP in the range of 2.5 to 3.