To comply with Indoor Environmental Quality Credit, Interior Lighting, Option 1. Lighting Control,

the tenant of a new office building will require 93 lighting control devices with at least three lighting

levels per floor. This is because the credit requires that at least 90% of individual occupant spaces

have lighting controls that enable occupants to adjust the lighting to suit their individual tasks and

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1. The credit also requires that all shared multioccupant spaces have lighting controls

that enable adjustments that meet the needs of the group1. According to the LEED BD+C Reference

Guide, an individual occupant space is defined as an enclosed space or an open space that is

occupied by one person and is at least 50 square feet (4.6 square meters) in area1. A shared

multioccupant space is defined as an enclosed or open space that is occupied by more than one

person and is at least 100 square feet (9.3 square meters) in area1.

Based on the given information, each workstation can be considered as an individual occupant space,

and each bathroom facility and conference room can be considered as a shared multioccupant space.

Therefore, the number of lighting control devices per floor can be calculated as follows:

For the 100 workstations, 90% of them need lighting controls, which is 90 workstations. Each

workstation needs one lighting control device, so the total number of lighting control devices for the

workstations is 90.

For the two bathroom facilities, each facility needs one lighting control device, so the total number of

lighting control devices for the bathroom facilities is 2.

For the one conference room, one lighting control device is needed, so the total number of lighting

control devices for the conference room is 1.

The total number of lighting control devices per floor is then 90 + 2 + 1 = 93.

Reference: Interior lighting