PRODUCT DATA
Footcandles
Energy
Savings
Begin
Perceived
Light
Level
Min.
Light
Level
Light
Maintain
Level
Light generated from
fixture attached to Leviton
Lighting Control System
Ambient light
6AM
8AM
NOON
10AM
2PM
4PM
6PM
Leviton Manufacturing Co., Inc.
201 N. Service Rd. Melville, NY 11747-3138 • Tech Line: 1-800-824-3005 • Fax: 1-800-832-9538
© 2013 Leviton Manufacturing Co., Inc. All rights reserved. Subject to change without notice.
Photocells
Photocells
Leviton’s Photocell sensors precisely monitor
either task or ambient light levels. As part of a
Leviton energy management system, photocells
work with other components in the system
to automatically adjust light levels to a user-
defined level. Photocells are most suitable for
installation in rooms with windows and open
spaces receiving substantial ambient light.
Photocells must be hardwired to a compatible
Leviton lighting control system. The photocell
measures ambient light in a specific area and
sends this data to a dimmer or relay that, in
turn, adjusts fixtures to a constant lighting
level as measured in that specific area. Daylight
Harvesting is achieved as lights in a room (with
windows or significant, artificial ambient light)
automatically brighten or dim depending on how
much light the photocell detects.
DAYLIGHT HARVESTING
With Daylight Harvesting, ambient (often natural)
light supplements in-room, artificial light in order
to keep a constant lighting level while saving
energy. This constant level is programmed into
a compatible control device. Once hardwired to
the photocell, the dimmer or relay will receive
the photocell’s real-time light measurement and
maintain a steady level within the photocell’s
area of detection.
RULES OF OPERATION
Measured light level = Light Maintain Level
Action: Output to lights remains constant
Measured light level < Light Maintain Level
Action: Lights are brightened
Measured light level > Light Maintain Level
Action: Lights are dimmed
