The wireless daylight harvesting photocell offers a dependable and efficient solution for automatic light level control in commercial and institutional environments. Compact and battery powered, this photocell simplifies installation and setup while maintaining long-term reliability. Its flexible mounting design makes it a preferred choice among contractors, significantly reducing total installation time and minimizing the complexity of wireless pairing. Each photocell can be linked in seconds to one or more wireless load controllers, such as wall switch models or power pack controllers, allowing seamless integration into a lighting control network. The unit also includes an auto-setpoint selection mode, which assists in automatically determining the appropriate controlled light level for a space.
In operation, the wireless daylight harvesting sensor continuously measures the ambient light within a room and transmits that information to connected load controllers. These controllers process the light data and adjust the connected lighting according to configured thresholds and operational modes. When daylight levels are high, the lighting is gradually dimmed to maintain a balanced environment, while in periods of low or no daylight contribution, lighting levels increase to ensure consistent brightness. In some configurations, the lighting system can be programmed to switch off completely in spaces with sustained high daylight levels. The auto-setpoint calibration mode enables the photocell to determine its own ambient light threshold based on current conditions, while additional preset values can also be selected through the connected controller for greater customization.
The photocell supports several modes of operation to accommodate different applications and energy code requirements. In Daylight Harvesting Control, gradual dimming is applied to maintain optimal light balance without distracting occupants, ideal for offices and classrooms. Lighting remains at a low trim level once daylight levels rise, with an optional setting to turn lights off completely when sufficient natural light is present. Daylight Harvesting with On/Off Control functions similarly but automatically turns lights off under bright conditions. On/Off Photocell Control is intended for public areas such as corridors or entryways, where full switching of lights on and off is acceptable. This mode includes a built-in “deadband” function to prevent frequent cycling of lights by maintaining a buffer between the measured and target light levels. The Inhibit Only Photocell Control mode prevents lights from turning on when there is sufficient daylight during initial occupancy but will allow lights to activate if ambient levels fall below the threshold. In this mode, lighting is never turned off solely due to daylight increase.
Installation and configuration are straightforward. The photocell wirelessly links to controllers using a simple three-second push-button process, and all data transmitted between devices is fully encrypted for security. Its compact, matte-finish housing supports multiple mounting options, including a nipple attachment with an integrated hole saw for ceiling applications. The unit operates on a single CR123(A) lithium battery, included with the product, and is optimized for a ten-year lifespan under default conditions. A built-in non-volatile memory preserves all configuration settings even if the battery is depleted. When battery life approaches 10%, the system provides a visual warning by blinking connected lights on, off, and on again upon activation, signaling that replacement is needed.
Operating on the 915 MHz ISM band, the photocell maintains a wireless range of up to 80 feet line of sight or 40 feet through typical building obstructions. It functions effectively within a temperature range of 32°F to 122°F (0°C to 50°C) and a relative humidity range of 0–95% non-condensing, suitable for indoor use only. The device also includes a test mode that allows quick verification of wireless linking and light response.
Compatible with wall switch and power pack controllers, the wireless daylight harvesting photocell supports multi-zone configuration for flexible lighting management across different spaces. It can be deployed alone or alongside occupancy sensors to achieve both daylight and motion-based control. The system complies with ASHRAE 90.1, IECC, and Title 24 energy code requirements, helping facilities meet modern efficiency standards while maintaining occupant comfort and seamless automation. Replacement batteries are widely available from standard retail outlets or directly from the manufacturer, ensuring easy long-term maintenance and uninterrupted control performance.
https://www.sensorworx.com/wireless-photocell-and-daylight-harvesting/
