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 2009
Metal halide lamps occasionally fail "non-passively" at end of life, which may cause hot quartz elements to be ejected from the light fixture, presenting a fire risk. READ MORE
December 2008
Energy codes provide a minimum standard for new construction of commercial buildings. Your local code may be a unique one developed by the state or municipality, such as California’s Title 24, or may be based on a version of ASHRAE 90.1 (1999, 2001, 2004, 2007) or the International Energy Conservation Code (IECC) (2001, 2003, 2006) standards. READ MORE
December 2008
There currently is a push to replace linear fluorescent T8 and T12 lamps with linear light-emitting diode (LED) replacement lamps, but are LEDs ready to take on this workhorse in general lighting? The evidence suggests no, not yet anyway, except perhaps in some specialty applications, such as refrigerated display cases. READ MORE
November 2008
In recent years, the lighting market has seen new general lighting products, introduced for niche applications, become mainstream. As a result, it is increasingly important for electrical contractors to understand the basics of light-emitting diodes (LEDs) to successfully work with this rapidly growing lighting technology. READ MORE
November 2008
Incandescent reflector lamps. fluorescent magnetic, mercury vapor and probe-start metal halide ballasts—they’ve had a good run, but now it’s time to gracefully retire them. Their competitors are simply too efficient. READ MORE
October 2008
Housing starts in 2007 had declined by more than one-third from their 2005 peak, but the market for home technologies remains strong, according to the Sixth Annual State of the Builder Technology Market study conducted by the Consumer Electronics Association. READ MORE
September 2008
Here’s a light source with the potential to reduce the nation’s energy costs by 6–7 percent, to reimagine the light fixture as a highly compact and dynamic element, to keep 2 to 4 tons of mercury out of landfills and incinerators each year, and to give building owners lighting that doesn’t require lamp replacement for up to a decade or longer. READ MORE
September 2008
In 1972, the Illuminating Engineering Society of North America (IESNA) recommended a light level of 70 foot-candles (fc) for typical tasks in open offices, which was typically provided by magnetic-ballasted F40T12 2-by-4 troffers, creating a lighting power density (LPD) as high as 5.5W per square foot. By 1990, IESNA had refined its recommendation to 15–50 fc. READ MORE
August 2008
Enrollment in public elementary and secondary schools rose 24 percent between 1985 and 2006, according to the National Center for Education Statistics. In 2006, nearly 50 million students were using more than 385,000 school buildings. READ MORE