Crestron GLS-LCCT – SolarSync Outdoor Daylight and Color Temperature Sensor

Product Overview

The Crestron GLS-LCCT SolarSync is an outdoor daylight and correlated color temperature (CCT) sensor designed for integration with Crestron lighting control systems. It measures both light intensity (0-100,000 lux) and color temperature (2,000K-25,000K) using multi-spectral sensing technology, enabling Crestron systems to automatically adjust tunable white lighting fixtures to match natural daylight conditions throughout the day. It is intended for rooftop, exterior wall, or skylight-adjacent installations.

Product Description

The GLS-LCCT communicates via Cresnet slave mode and connects to the Crestron system with a 3 ft attached cable with four flying leads. Its 360° semispherical field of view captures ambient light from the full overhead hemisphere, providing accurate measurements regardless of sun position. The IP67 rating ensures protection from dust ingress and submersion, making it suitable for exposed outdoor mounting in all weather conditions. A PTFE housing with acrylic diffused dome provides UV and chemical resistance. Mounting is via a 1/2 in. conduit knockout to a standard j-box or enclosure.

Key Features

• Dual measurement: light intensity (0-100,000 lux) and correlated color temperature (2,000K-25,000K)
• Multi-Spectral Sensing Engine with CIE 1931 2° Standard Observer coordinates
• 360° semispherical field of view for full ambient light capture
• IP67 rated: dust tight and waterproof per IEC/EN 60529
• Cresnet slave mode; 5W power via Cresnet (209 mA @ 24 VDC)
• PTFE housing with acrylic diffused dome; UV and chemical resistant
• 3 ft (0.91 m) attached cable with 4 flying leads (24 AWG)
• Certifications: CE

Typical Applications

• Outdoor daylight sensor for Crestron circadian lighting control systems
• Tunable white lighting automation in offices, schools, and healthcare facilities
• Rooftop daylight harvesting sensor for commercial building energy management
• Residential whole-home lighting color temperature automation throughout the day
• Skylighted spaces where indoor color temperature should track outdoor daylight

Technical Specifications

• Model: GLS-LCCT
• Weight: 0.31 lb (142 g)
• Dimensions: 2.77 in. (71 mm) H; 2.69 in. (69 mm) diameter; 1.85 in. (47 mm) protrusion from mounting surface
• Power: Cresnet; 5W (209 mA @ 24 VDC); 70 mW typical; 4.9W max (with self-heating)
• Heat Dissipation: 17 BTU/hr maximum
• Sensor Technology: Multi-Spectral Sensing Engine; CIE 1931 2° Standard Observer
• Color Temperature Range: 2,000K to 25,000K
• Light Sensitivity: 0 to 100,000 lux (0 to 9,290 foot-candles)
• Field of View: 360° semispherical
• Communications: Cresnet slave mode
• Connection: 3 ft (0.91 m) attached cable with 4 flying leads (24 AWG)
• Housing: PTFE with acrylic diffused dome, white finish
• Mounting: 1/2 in. conduit knockout to j-box or enclosure
• Operating Temperature: -4 to 185°F (-20 to 85°C)
• Ingress Protection: IP67 (dust tight and waterproof per IEC/EN 60529)
• Certifications: CE

Frequently Asked Questions

Q: How does the GLS-LCCT differ from a standard photosensor?
A: Unlike standard photosensors that only measure light intensity (lux), the GLS-LCCT also measures correlated color temperature (CCT). This allows Crestron to adjust both the brightness and the color temperature of tunable white fixtures simultaneously to match outdoor daylight conditions.

Q: Does the GLS-LCCT require an outdoor-rated enclosure?
A: The GLS-LCCT is IP67 rated and is itself weatherproof. It mounts via a standard 1/2 in. conduit knockout to a j-box or enclosure. The j-box used for mounting should be appropriately rated for outdoor installation.

Q: What Crestron programming is needed to use the GLS-LCCT with tunable white fixtures?
A: The GLS-LCCT sends lux and CCT data via Cresnet to a Crestron processor. Programming to translate those readings into control signals for specific tunable white fixtures depends on the system configuration. Crestron provides programming modules and documentation for common lighting control scenarios.