The standard light fixture is a 2′ x 4′ recessed fluorescent troffer designed for 4-32 watt bulbs. Total watts per light fixture are 128.
Determining the modular lighting systems needed for a particular application can be a complex process involving several different formulas. Listed below are some simplified guidelines to help figure the quantity of lights needed. (Starrco standard modular lighting design is based upon 70-foot candles):
|Recommended Foot Candles of Lighting|
|Rooms||lavatories||office area||classroom||drafting||fine drafting|
|conference room||stores||proof reading||general assembly||display lighting|
|cafeteria||reading room||general assembly||testing||fine assembly|
|–||deskwork||testing||counter display||prolonged seeing|
Quantity of Light @ 50FC = Square foot of room x 1.5 watts / 160 watts
Quantity of Light @ 70FC= Square foot of room x 2.0 watts / 160 watts
Quantity of Lights @ 100FC = Square foot of room x 3.0 watts / 160 watts
Note: to reduce the quantity of lights needed for an entire area, concentrate the lighting in the areas where the actual work is being performed. Limit the lighting in common or non-critical areas. This not only reduces the number of lights in an area, but will also reduce cooling requirements and maintenance costs.