The difference between the yearly cost of energy for your existing system and the yearly cost of energy for the recommended system.

A measure of the light generated by one lamp. Note: Ballast factor is taken into account.

A measure of the actual lumen output for a specific lamp-ballast system relative to the full rated lumen output of the lamp being used. For example, if a lamp's standard output is 3,000 lumens, a 0.90 ballast factor will drive the lamp at 90% output, which is 2,700 lumens. A ballast factor is not a measure of energy efficiency. Although a lower ballast factor reduces lamp lumen output, it also consumes proportionally less input power. Careful selection of a lamp-ballast system with a specific ballast factor allows designers to better minimize energy use by "tuning" the lighting levels in the space.

Total lumens produced by all lamps in the fixture. Note: Ballast factor is taken into account.

The ratio of total light lumens produced to the amount of watts consumed. This is also referred to as the efficacy of the lamp/ballast system.

A fixture where the heat from the lamps can acculumlate around the lamps, such
as when the lamps are enclosed or simply surrounded by the fixture on the top
and sides. Most office lighting, such as parabolic troffers, fit in this category.

A fixture hanging on or below the ceiling with the lamps fully
exposed to the room environment, such as a strip fixture.

A T8 is a fluorescent lamp that is tubular in shape and 8/8ths of an inch in diameter.

A T12 is a fluorescent lamp that is tubular in shape and 12/8ths of an inch in diameter.

The number of lamps used in your fixture.

The average number of days a week the lamps operate.

De-lamping is a great way to save money and lower maintenance costs while still producing a similar amount of light.

This is needed to calculate accurate annual savings, which depend upon statewide commercial utility rates.

Your installation location will help create a preview of how the proposed fixture will look like.

Enter the total number of lamps you desire to retrofit. Enter between 1 and 9999.

We will provide you with average electrical price based on your location. You can manually change it later if you want.

Existing lighting often provides an unnecessary amount of light, and reducing light output can save a significant amount of energy. In fact, light output can be reduced by up to 25% without a noticeable change in light levels.

Lumen values per manufacturer specifications.

Mesopic is the average of Scotopic and Specification Sheet lumen values.

Scotopic (aka. pupil lumens) refers to lumen output perceived by a person’s eyes. Two lamps rated as having equivalent lumen output, may be perceived as having different lumen outputs. The scotopic factor adjusts for this phenomenon by showing lumens actually perceived by a person’s eyes.

The difference between the input wattage and the wattage delivered to the lamps.

This figure represent the total kWh (Usage) consumed annually.

This figure represents the total kW (Demand) consumed annually.

This figure represent the price per kWh of electricity.

The figure represents the price per kW of demand.

The closer to 100 the CRI is, the more closely colors are revealed as they would appear in natural daylight.

Scotopic (aka. pupil lumens) refers to lumen output perceived by a person’s eyes. Two lamps rated as having equivalent lumen output, may be perceived as having different lumen outputs. The scotopic factor adjusts for this phenomenon by showing lumens actually perceived by a person’s eyes.

This figure represents lumens produced by the fixture at mean lamp life.

This is the average between the amount of Scotopic lumens per fixture and Spec Sheet lumens per fixture.

This is calculated by multiplying the Scotopic Factor by the mean lumens per fixture.

This figure represents system efficiency taking light output as measured by lumens and dividing it by input wattage.

A lamps elapsed time from a cool start through its start-up cycle.

The elapsed time between lamp shut-off and restart cycle completion after the lamp is switched off or power is interrupted.

This figure represents the amount of mercury per lighting system.

This number shows the amount of UCD lamps you would need to produce to equal the amount of Mercury that is in one of your existing lamps.

This number represents the amount of light output at end of lamp life as a percentage of initial lamp lumen output.

The typical amount of time expected between lamp replacement.