Photocell & Daylight Harvesting
SENSORWORX line voltage photocell and daylight harvesting sensors provide a compact control solution without requiring a powerpack. Basic on/off units are capable of directly switching lights off when ambient levels are high enough that desired overall light levels will be still be maintained. Lights will be switched back on once ambient level falls below the desired setpoint.
Units with the daylight harvesting (dimming) option track a space’s overall illumination and dim connected lighting to achieve energy savings. During times of high daylight contribution to a space, controlled artificial lighting will be gradually dimmed to a minimum dimmed level. During times of no or low daylight contribution, controlled artificial lighting will increase back up to its maximum level. The sensor can also be configured to switch lighting off completely in maintained high daylight conditions. Additional configurable parameters include high & low trim levels and fade rates.
All photocells provide the option of selecting the ambient light threshold (e.g., setpoint) from a range of preset values or running an auto-selection mode where the unit will determine the setpoint based on the measured amount of light it is controlling.
There are two types of photocell operation; ON/OFF PHOTOCELL CONTROL and DAYLIGHT HARVESTING CONTROL (see descriptions below).
On/Off Photocell Control
Recommended for public spaces (hallways, entryways, etc) where fully switching lighting off/on will not be noticed .
Photocell will switch lights off if ambient light level surpasses threshold and back on if level drops.
To prevent cycling of lights back on after lighting is turned off, a “deadband” level equal to the measured level of light being controlled is continuously maintained in the unit. For lighting to turn off the ambient light level must be higher than the sum of the setpoint and the deadband.
Daylight Harvesting Control
Recommended for spaces where it is important to not distract occupants (e.g., offices, classrooms).
Unit will gradually dim lighting in order to maximize energy savings while maintaining desired overall lighting level.
After dimming to low trim level, unit can optionally be enabled to turn off lights completely.
Features / Photocell & Daylight Harvesting
Auto-Setpoint Selection Mode
On/Off Control and/or Daylight Harvesting (Dimming)
Adjustable High & Low Dimming Trim Level
Electronically Timed Switching Designed for LED Fixture Control
Compact Size and Matte Finish
4.00” Diameter x 1.25” Height
(10.16 cm x 3.17 cm)
Mud Ring w/ 2.75” Spaced Ears
3.5” Trade Size Octagon Box
32°F to 122°F
(0°C to 50°C)
Indoor Use Only
MVOLT (120-277 VAC)
800W @ 120 VAC
1200W @ 277 VAC
CFL, Electronic/Magnetic Ballasts (Fluorescent)
0-10 VDC Ballasts or Drivers
Compliant with IEC 60929
Daylight Harvesting to Low Trim
Daylight Harvesting to Off
Photocell Override (On/ Off)
Sensors can be used to meet
ASHRAE 90.1, IECC, & Title 24
energy code requirements
On/Off Photocell Application
Daylight Harvesting Application
EXAMPLE MODEL # SWX-250-2-D
|SWX–||Ceiling Mount Ambient Daylight Photocell||250||Line Voltage||–2||Dimming / Daylight Harvesting (0-10V)||–D|
|SWX-299||Ceiling Sensor Trim Ring for Single Gang Mudring, Handy Box, or 4” Octagon Box|