Daylight savings

A new dimming system that responds to levels of daylight could save 30 per cent in commercial lighting energy consumption.

Scientists at Rensselaer Polytechnic Institute’s Lighting Research Center (LRC) have developed a simple, cost-effective, energy-saving device designed to harvest daylight automatically. The DaySwitch was designed as an alternative to traditional dimming ballast systems that adjust light levels by reducing the lamp current.

“The DaySwitch is designed to build end-use efficiency by reducing light energy usage in commercial buildings and maintaining occupant satisfaction,” said Peter Morante, director of energy programs at the LRC. “It is estimated that the DaySwitch will be able to reduce lighting energy consumption by 30 per cent in buildings with significant daylight contribution through windows or skylights, allowing for a payback period of approximately three years.”

Typical dimming systems have several drawbacks, including high initial cost and difficult photosensor programming and installation. As a result, dimming systems have not permeated the market, according to Morante.