| MAGNETIC |
ELECTRONIC |
| Core & Coil |
Electronic, microprocessor |
Mean Lumens
Good lighting systems are specified on the basis of mean or average light output of the lamp. This mean is defined as the light output, measured in lumens, at 40% of the lamps rated life.
| MAGNETIC |
ELECTRONIC |
Rated Lamp Life
20,000 hours
Mean Calculated @ 40% of rated lamp life
8,000 hours
Lumen Maintenance (Output @ Mean)
64% of initial lumens |
Rated Lamp Life
20,000 hours
Mean Calculated @ 40% of rated lamp life
8,000 hours
Lumen Maintenance (Output @ Mean)
86% of initial lumens |
Cost of Ownership - Long Term Savings*
While the initial cost of a magnetic ballast is considerably less than a high performance electronic ballast, the over-all cost of ownership is much higher.
| MAGNETIC |
ELECTRONIC |
Installing more fixtures means...
Higher installation labor
Higher material costs
Higher energy costs |
Install up to 36% fewer FUTURE BRITES
Achieve the same light levels
Lower cost of ownership |
Re-lamping
Higher mean lumens push the re-lamping cycle out for dramatic savings in your maintenance budget. FUTURE BRITE electronic technology extends relamping, yet maintains light levels.
| MAGNETIC |
ELECTRONIC |
Lumen Output
(expressed as % of initial lumens @ hours of operation)
64% @ 12,000 hours
44% @ 18.000 hours |
Lumen Output
(expressed as % of initial lumens @ hours of operation)
85% @ 12,000 hours
78% @ 18.000 hours |
Improved Lumen Maintenance...The First Step to Savings
The best lighting designers specify maintained rather than initial light levels.
Lumen Maintenance
With most medium wattage lamps, the published average lamp life is 20,000 hours. "Mean" light output is defined as 40% of rated life, or 8,000 hours for a 20,000 hour lamp.
The chart compares standard probe start (magnetically ballasted), pulse start (magnetically ballasted) and pulse start (electronically ballasted) metal halide lamps. To design for the same mean light level requires 25% more probe start and 13% more pulse start (magnetic ballast) than pulse start with an electronic ballast.
Architects generally consider end of life levels* (i.e. they design to mean lumens, not initial lumens) in their designs. As can be seen from the chart, an electronic system can be designed for lower initial levels, yet still have more light at end of life.
