The structural framework of industrial buildings, especially warehouses, forms interior spaces called “bays”. Selection of general lighting luminaires is based on the height of the bay and should provide more or less uniform illumination of the area :
Low-bay – bottom of luminaire is <18 ft. off the floor
Medium-bay – bottom of luminaire is 18-25 ft. off the floor
High-bay – bottom of luminaire is >25 ft. off the floor
The majority of tasks occur in the vertical plane
Provide 20-30 foot candles of uniform illumination on the vertical surface of goods stored on the racks
Horizontal illumination is a secondary concern but is important for navigation in the aisles and reading of pick tickets by forklift operators
Reflected glare affects readability and scanning accuracy.
Avoid clear plastic tape and wraps on packaged goods.
Light colored packaging and dark contrasting text labels provide better contrast and enhance readability
Glare from light sources should be avoided
Light sources, especially HID, should be shielded to avoid disability glare when looking up to tops of racks
Indirect luminaires combined with reflective ceilings produce good visual comfort especially when display screens are in use (workstations, handheld terminals, and on forklifts)
Aisles can be illuminated with classic high-bay HID luminaires (15 feet and above) Must be spaced close enough to eliminate dark areas between luminaires
Spacing can be increased when using low-bay luminaires or aisle-lighting luminaires with if an asymmetric light distribution pattern
Highly efficient T8 and T5 HO fluorescent luminaires can be used at mounting heights up to 30 feet. Typically installed in continuous rows along an aisle or individually mounted. (reflector, lensed, or open designs)
Warehouse spaces that are accessed intermittently provide opportunities to save energy. Motion sensors and control devices interface with HID and fluorescent multilevel ballasts to lower light levels when spaces are unoccupied by personnel or equipment.
Light is Productive: Lean Strategies for Industrial Facilities
Lighting Layout Tool
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