One of the most common questions that facility and operation managers ask is “How much light do I need to properly illuminate my facility?” Since 1958, the Illuminating Engineering Society has been publishing recommended illuminance levels for a multitude of tasks and facility types in table form.  The published tables provide guidance for both generic tasks and hundreds of very specific tasks.  In order to understand these tables, it’s best to start with an overview of how light is measured. This article gives a brief explanation of how light is measured and provides … Continue reading

For many that keep track of the global climate debate, the next 12 days is about as exciting as it gets.  That’s because from December 7th through the 18th,  193 of the world’s nations will have their top climate and environmental ministers in Copenhagen for the 15th annual Conference of the Parties (or COP15) of the United Nations Climate Change Convention.  The goal for this year’s conference is to establish an ambitious global climate agreement that can take the place of the expiring Kyoto Protocol. … Continue reading

T5 and T5HO fluorescent high bay fixtures and other T5-based specialty lights are built around a linear fluorescent tube lamp.  Like other types of lamps, the number in the name of the lamp reflects its size.  The “T5” name reflects the diameter of the tube in eighths of an inch.  A T5 lamp is five-eighths of an inch (5/8”).  Similarly, a T8 fluorescent lamp is eight-eighths (or one inch) in diameter and a T12 fluorescent lamp is 12 eighths (or 1-1/2 inches) in diameter.  One of the features that make a T5 bulb and T5-based high bay light fixtures more efficient is the f … Continue reading

President Bush has signed into law an extension of the Energy Policy Act of 2005 that will continue to provide the $1.80 per square foot tax deduction for energy efficient commercial and industrial building upgrades through December 31, 2013. This five-year extension was passed by the Senate on October 1 by a vote of 74-25 and by the House on October 3 by a vote of 263-171 as part of the Emergency Economic Stabilization Act of 2008. The Energy Policy Act of 2005 provides valuable tax deductions for businesses that complete energy efficient upgrades on their lighting, … Continue reading