The GLA‑LDL‑PC‑0‑10 is a dual-loop photosensor that continually measures ambient light in order to achieve the optimal balance of natural and artificial lighting in an indoor space in daylight harvesting applications. By harnessing natural daylight from windows and skylights, electrical lighting can be dimmed, reducing energy usage while maintaining a consistent light level for a more efficient and comfortable work or living space.

In closed-loop type daylight harvesting applications, the GLA‑LDL‑PC‑0‑10 is installed on the ceiling directly above the primary work area. It measures all light within a 60° cone, which consists predominately of reflected light, acquiring the most natural approximation of perceived changes in ambient light levels.

In open-loop type daylight harvesting applications, the GLA‑LDL‑PC‑0‑10 is installed on the ceiling near a window or in the light well of a skylight, directed toward the incoming daylight and away from any electrical lighting fixtures. The system estimates the total amount of ambient lighting in the room according to the light level measured by the photocell.

The GLA‑LDL‑PC‑0‑10 includes hardware to facilitate flush or surface mounting to a drywall or drop-tile surface. Its simple 3-wire interface allows for direct connection to a Crestron® control system via a single Versiport I/O or analog input port, with 24 V power taken from the Cresnet® network control bus.¹

Using an optional sensor integration module (GLS‑SIM or ZUMMESH‑JBOX‑SIM for a Zūm® J-Box, both sold separately), the GLA‑LDL‑PC‑0‑10 becomes a full-featured Cresnet device, streamlining the total lighting system. Cresnet provides a simple solution for configuring and wiring sensors as part of any complete Crestron system. The Cresnet bus is the communications backbone for many Crestron keypads, lighting controllers, shade motors, sensors, and other devices.