Which lighting control could the design team specify to meet the credit requirements for open-office workstations?

A project is pursuing Indoor Environmental Quality Credit, Interior Lighting, Option 1. Lighting Control.

Which lighting control could the design team specify to meet the credit requirements for open-office workstations?
A . Standard on-off switches at each workstation
B . Plug-in task light at each workstation that allow for on, off and a 50% light level
C . Overhead lighting for the open-office space with fully automatic dimming via daylight sensors for the space
D . Overhead lighting for the open-office space with controls that allow for on, off and a 50% light level for the space

Answer: D

Explanation:

To meet the requirements for Indoor Environmental Quality Credit, Interior Lighting, Option 1, the design team should specify lighting controls that enable adjustments to suit individual tasks and preferences. This includes providing controls that allow for on, off, and at least one intermediate light level, such as 50%. Overhead lighting with these controls for the open-office space would meet this criterion.

Reference: The LEED reference guide for Interior Design and Construction provides detailed information on the requirements for lighting controls under the Indoor Environmental Quality Credit, Interior Lighting, Option 1. Specifically, it states that for at least 90% of individual occupant spaces, there must be individual lighting controls that enable occupants to adjust the lighting to suit their tasks and preferences, with at least three lighting levels or scenes (on, off, midlevel) 1.