Light

Detailed requirement

Part 1: Visual Acuity for Focus

The following requirements are met at workstations or desks:

• The ambient lighting system is able to maintain an average light intensity of 215 lux [20 fc] or more.
• The ambient lighting system is zoned in independently controlled banks no larger than 46.5 m² [500 ft²] or 20% of open floor area of the room.
• If ambient light is below 300 lux [28 fc], task lights providing 300 to 500 lux [28 to 46 fc] at the work surface are available upon request.

Part 2: Brightness Management Strategies

Provide a narrative that describes strategies for maintaining luminance balance in spaces, which takes into consideration at least two of the following:

• Brightness contrasts between main rooms and ancillary spaces, such as corridors and stairwells.
• Brightness contrasts between task surfaces and immediately adjacent surfaces.
• Brightness contrasts between task surfaces and remote, nonadjacent surfaces in the same room.
• The way brightness is distributed across ceilings in a given room.

Part 3: Commercial Kitchen Lighting

The following light levels are achieved:

• Maintained average of at least 500 lux [46 fc] of lighting at countertops and other food preparation or production areas.

• Maintained average of at least 200 lux [18 fc] of lighting in dishwashing areas.

Part 4: Visual Acuity in Living Environments

In all bedrooms, bathrooms, and rooms with windows, one or more fixtures provide the following:

• Alerting lights able to provide a maintained average of 250 lux [23 fc] as measured 0.76 m [30 inches] above finished floor.
• Evening lights able to provide a maintained average of 50 lux [5 fc] as measured 0.76 m [30 inches] above finished floor.
• Lights continuously dimmable to 25%.

Part 5: Visual Acuity for Learning

The ambient lighting system at desks in classrooms for the specified age groups meet the following requirements:

• Able to maintain an average of 175 lux [16 fc] or more measured on the horizontal plane, typically 0.76 m [30 inches] above finished floor.

Part 6: Visual Acuity for Dining

The ambient lighting system at dining surfaces for the specified restaurant types meet the following requirements:

• Cafeterias: Able to maintain an average of 150 lux [14 fc] or more measured on the horizontal plane at the height of the dining surface.
• Casual dining and fast food: Able to maintain an average of 100 lux [9 fc] or more measured on the horizontal plane at the height of the dining surface.
• Fine dining: Able to maintain an average of 30 lux [3 fc] or more measured on the horizontal plane at the height of the dining surface.

See detailed requirement for Visual Lighting Design