Home Product Support Contact

Fixture Replacement Estimator
Copyright ©2004
R & D Electronics
All Rights Reserved
Figure out how many fixtures with lamp B can replace the fixtures with lamp A while maintaining the same light level. Or, if you leave the number of fixtures unchanged, figure out the percentage change in light level.
.SEE INSTRUCTIONS AT BOTTOM.
LAMP A
LAMP B
Lamp or System Name (optional)
No. of Lamps per Fixture
Lamp Mean Lumens
Ballast Factor (BF)
Coeff. of Utilization (CU)
No. of Existing Fixtures (Lamp A)
.
SOURCE MEAN LUMENS PER FIXTURE
USABLE MEAN LUMENS PER FIXTURE
(1) Change in Average Light level
if number of fixtures is left unchanged.
(2) No. of Fixtures (Lamp B)
required to maintain same average light level.

INSTRUCTIONS: Enter the correct numbers in the gray cells and press "Calculate". For an explanation of the terms "Ballast Factor" and "Coefficient of Utilization," you may click on the labels.

This tool may be used to estimate the reduction (or increase) in light levels when you replace lamps without changing the number of fixtures, OR it can estimate the number of fixtures (with lamp B) required to maintain the same average light level.