Field Luminance Mapping of the Sky


IES Annual Conference 2010—When sky luminance distributions are measured far from a laboratory facility, portable and inexpensive instruments are useful. High dynamic range (HDR) photography has become a practical method for sky luminance mapping. However, long exposure photography directed at the sun can cause severe damage to digital camera sensors. To avoid this problem, a system was designed that integrates an adjustable shading disk with an HDR camera.

Adaptive Outdoor Lighting for the Health Care Sector


In 2014, NorthBay VacaValley Hospital became one of the first U.S. health care facilities to install a network-controlled adaptive outdoor LED lighting system. The hospital already had up-to-date, energy-efficient outdoor lighting installed, yet this award-winning installation reduced the hospital's outdoor lighting energy use 66.4%. Energy savings correspond to occupancy rates of 35–55% observed at different areas of the site.


Performance Testing Report: Omni-directional LED Replacement Lamps


A number of lighting manufacturers now produce LED replacement lamps for traditional 60W incandescent lamps, and stakeholders at the state and national levels face decisions regarding quality standards for this product category. To assist these stakeholders and assess the current state of this segment of the lighting market, CLTC performed photometric and electrical tests on samples of 26 commercially available A19 and A21 omnidirectional LED replacement products.

ACEEE 2012: California's Advanced Lighting Controls Training Program


This work will discuss the CALCTP program, its energy savings potential, the challenges in educating an established trade group in new technology, programs stemming from the initial CALCTP effort, and the immediate need for ongoing support to ensure this model program continues to succeed in the coming years. Presented by Cori Jackson at the American Council for an Energy-Efficient Economy (ACEEE) Conference 2012.

UC Davis Professor Calls for a Statewide "Time Out" on Further Public Purchases of LED Street Lights


Street lights with controls systems offer dynamic dimming during long periods of inactivity, a feature with tremendous potential to save energy, mitigate waste, reduce light pollution, and increase public safety. In spite of all these advantages, there is no nationwide control standard established to date, and LED street lights are being installed en masse without this important feature. These fixtures are likely to be in use for as long as 20 years, so the fixed-wattage, un-retrofittable fixtures sold today represent a significant loss in long-term savings opportunity. 

Directional LED Lamps – Laboratory Testing Program


The retail sector constitutes one of the largest energy consumers in the U.S., and halogen parabolic aluminized reflector (PAR) and multifaceted reflector (MR) lamps are common retail lighting choices. LED replacement lamps have the potential to transform lighting energy use in this sector, and manufacturers of LED PAR and MR lamps now claim comparable photometric performance, as well  as much greater longevity, than traditional halogen lamps.

UC Davis Smart Lighting Initiative: Lighting the Way to a Sustainable 2nd Century


Lighting accounts for about a quarter of California’s electricity use, and installing energy-efficient lighting can lead to significant energy, maintenance, carbon, and economic savings, according to the California Public Utilities Commission (CPUC). In September 2010, the CPUC adopted a plan to achieve a 60–80% reduction in statewide electrical lighting consumption by 2020.


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