This demonstration is one in a series of advanced lighting demonstration projects completed through a joint initiative between the DesignLightsTM Consortium and the U.S. Department of Energy.
The Rhode Island Public Utility Commission, located in Warwick, Rhode Island, replaced their existing T8 fluorescent lighting with Philips DuaLED luminaires with onboard SpaceWise intelligent controls. This system allows for customization of light levels to meet application and occupant needs. Measurements show that replacement of the older fluorescents with LEDs saved 64% of the estimated annual lighting energy use. Along with this savings was a modest reduction in excessive pre-retrofit light levels in many areas. With advanced occupancy sensing and daylighting controls, an additional 3% of the baseline energy use was saved. Facility energy costs were reduced by about $4,700 annually. The total project cost of $110,900 has a payback of just under 15 years after $41,000 in utility rebates from National Grid.