Daylighting

New Dual-Loop Lighting Control Improves Daylight Harvesting and Energy Efficiency in Spaces with Skylights

03/01/2013

CLTC – Lighting control manufacturer WattStopper has launched a breakthrough advance in electric lighting control technology for daylight harvesting. The LMLS- 600 dual-loop photosensor control is the first device on the market to combine open-loop and closed-loop photo sensing strategies, greatly improving the accuracy and reliability of daylight sensing in spaces with skylights. The device is the result of research and development conducted in the labs of the California Lighting Technology Center (CLTC), part of the University of California, Davis. 

Adaptive Envelope Systems for Retail & Agriculture

Adaptive Envelope Systems for Retail & Agriculture

CLTC collaborated with the California Energy Commission and the California Institute for Energy and Environment (CIEE) to develop adaptive envelope technologies for retail and agricultural buildings. The objective was to develop systems that optimize both lighting and thermal efficiency in these facilities, using advanced fenestration materials, daylighting technologies and lighting controls.

Core Sunlighting Systems

Solar Canopy for Core Daylighting

Core sunlighting systems deliver sunlight deep into multi-story building cores, where daylight is not available through skylights or windows. An effective core sunlighting system offers physiological and psychological benefits to occupants while dramatically improving the quality and color rendering of lighting, reducing lighting electricity use up to 75%, and reducing electricity loads during peak demand periods.

Daylight Optimization for Skylights

Daylight Optimization for Skylights

CLTC is evaluating dynamic skylight systems that automatically adjust light transmission to minimize glare and manage solar heat gain, significantly improving both lighting quality and energy savings. Engineers are using one of the Center's integrating spheres to measure the transmittance of different sample units.

Applications include residential and commercial spaces that receive sufficient sunlight to require some form of shading for occupant comfort or to prevent solar heat gain.

Dual-Loop Photosensor Control System for Daylight Harvesting

Dual-Loop Photosensor Control System for Daylight Harvesting

Photosensor control systems have been available for more than two decades, but they have struggled to gain widespread use due to issues with reliability. To address these issues, CLTC partnered with WattStopper, Walmart, Sacramento Municipal Utility District, Southern California Edison, and San Diego Gas & Electric Company to develop a more reliable, more effective daylighting control system capable of sensing changes in daylight levels with increased accuracy and responding with more appropriate adjustments in electric light levels.

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