Open Office Solutions

USGBC Headquarters

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Task Light & Controlled Plug Loads
Ambient Lighting
Nighttime Operation
Lighting Energy Use
Power Use Throughout Day
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Task Light & Controlled Plug Loads

Each workstation has a controlled outlet and a non-controlled outlet. Task lights, lap-top computers, and other personal electronics can be plugged into the controlled outlet which will automatically turn off when the occupancy sensors time-out in each Open Office cluster. The task lights also have an on-board switch to allow local control for each workstation.

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Ambient Lighting

Daytime Operation (activated at 30 minutes after sunrise): During the day, Ambient
Lighting must be turned on manually using the switch located on a nearby column. This
manual operation is to encourage users to keep the ambient lighting turned off if there
is enough daylight in the space. Each switch has two buttons, and each button has two
functions.

Wall Switches

Click once: turns lights on & activates daylight dimming
Push and hold: brightens lights & disables daylight dimming
Click once: turns lights off
Push & hold: Dims lights & disables daylight dimming

Occupancy Sensors

When an Open Office Area has been vacated for a certain time perios, the lights will turn off automatically.
Day: Manual-On/Auto-Off
Night: Auto-On/Auto-Off

Daylight Dimming

When daylight dimming is activated, the dimmers respond to input from a photo sensor to maintain 25 footcandles.

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Nighttime Operation

(Activated 30 minutes before sunset.) At night, the Ambient Lighting will automatically turn on when motion is sensed by the occupancy sensors. This automatic operation will allow users to walk through the space to their office without having to manually turn lights on. Once a person settles into their workspace, the occupancy sensors in their area will maintain a low level of lighting in an adjacent Open Office. This provides a more comfortable setting for working at night than localized occupancy sensors that would leave the surrounding areas dark.

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Lighting Energy Use

ASHRAE 90.1 204 Allows: 1.10 W/SF
Installed Lighting Power Density: 0.62 W/SF (44% below ASHRAE)
Open Office Square Footage: 17,650 SF
Connected Lighting Load: 10,950 Watts
Predicted Annual Lighting Energy: (Both Baseline & Convia are based on installed lighting loads.)
Baseline Controls: 36,700 kWh/hr (Assumes occupancy sensors with Auto-On/Auto-Off control)
Convia Controls: 14,800 kWh/yr (60% below Baseline Controls)