Craig DiLouie

Lighting Columnist

Craig DiLouie, a lighting industry journalist, analyst and marketing consultant, is principal of ZING Communications. He can be reached at

Articles by Craig DiLouie

January 2011
Because surfaces and objects in typical spaces reflect light, they can play a part in lighting efficiency as extensions of the lighting system. By controlling room surface reflectances, light levels can be improved, creating opportunities to save energy. If light is not absorbed by a surface, it is reflected or transmitted to other surfaces. READ MORE
December 2010
The green design—good for the environment in that it makes buildings more sustainable—can be bad for lighting, as designers are incentivized to chase points that may require sacrifices to design. For lighting, it can be especially risky. Lighting power allowances in energy codes regulating new buildings have steadily declined over the last decade, enabled by advances in technology. READ MORE
December 2010
In part 1 of this two-part series on photosensors, I described the major characteristics of photosensors and ended with a problem: suppose we have a classroom in which we want to begin dimming the row of fluorescent lighting fixtures adjacent to a series of windows when daylight levels reach 150 percent of design light levels. What kind of photosensor will we need? READ MORE
November 2010
Daylight harvesting’s value proposition is fairly simple: as daylight levels increase in a space, electric lighting levels can be automatically reduced to maintain a target task lighting level and save energy. Because this system is automated, a device is needed to tell a controller that there is a high enough light level to warrant reduction of electric lighting. READ MORE
October 2010
Light-emitting Diode (LED) replacement lamps, including omnidirectional, directional and decorative lamps, are now proliferating the market. Unfortunately, many of these products have been of poor quality, according to CALiPER independent product testing conducted by the Department of Energy (DOE). READ MORE
September 2010
Once a venerable workhorse in commercial lighting, the fluorescent magnetic T12 ballast is now considered a dinosaur. All but extinct in new construction, there are still millions of these ballasts installed in commercial buildings throughout the United States. Now they are facing extinction in existing buildings, as replacement ballasts stop being available due to energy legislation. READ MORE
August 2010
Standard 189.1, the Standard for the Design of High-Performance, Green Buildings Except Low-Rise Residential Buildings, published in late January by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), provides the first code-intended commercial green building standard in the United States. READ MORE
July 2010
New York City’s dense urban landscape is populated with more than a million buildings that annually consume $15 billion in energy and generate 75 percent of the city’s carbon emissions. The 22,000 largest buildings, concentrated largely in Manhattan, account for roughly 45 percent of total floorspace and energy consumption. READ MORE
June 2010
Amalgam technology, fairly common among plug-in compact fluorescent lamps (CFLs), is now available in linear T5HO, T5VHO and T8VHO fluorescent lamps, making fluorescent lighting competitive in many high-intensity discharge (HID) applications. Fluorescent lamps produce visible light through a gaseous discharge process called fluorescence. READ MORE