I have written much in this blog about energy conservation and easy, inexpensive ways to save energy costs with a good payback. For most buildings and situations, lighting is on top of the list. While economics is an important reason to upgrade lighting, growing research indicates that using the right type of lighting will also improve your and your workers’ health and productivity, also improving the bottom line. Most buildings now use fluorescent lights, even compact fluorescents. While they use less energy per unit of light than incandescents, fluorescent lighting may contribute to a number of problems.
Why? Human eyesight and our brain developed from signals from our retinas based on sunlight during our evolution. The Sun shines the full spectrum of visible wavelengths, in addition to those higher and lower than the visible spectrum. We evolved as outside beings using sunlight to work and survive. Even as we moved to indoor living, domiciles were built with openings or (later) windows to let in sunlight. Artificial lights give off a limited spectrum of wavelengths and being much more recent, we have yet to evolve to handle these patterns. In addition, fluorescent lights flicker due to electricity flow pulses. While we generally do not consciously detect such flickering, our retinas and brains do. A third problem with fluorescents is its color rendering, a rating of a light’s color compared to natural sources. A color rendering index (CRI) of 100 means a range of colors equal to sunlight. Ironically, energy inefficient incandescent lights usually have a CRI in the upper 90’s. Many standard fluorescents are in the 50’s and 60’s; although modern, energy-efficient ones, such as T-8s and CFLs, have CRIs in the 80’s. High and low pressure sodium lamps, commonly used in outdoor lighting, have CRIs in the 20’s to 40’s. LEDs vary in their CRI; however, most recent brands are at least in the 80’s.
Research indicates at least some linkage between long-term exposure to fluorescent lights with migraine headaches, eye strain, sleep deprivation, anxiety, depression, hormonal disruptions, certain cancers, and obesity.
What can you do to lessen these effects in your office and home?
• Bring in sunlight. That is, encourage workers to get outdoors in the sun a few times a day. Also, try to move workers to spaces away from the interior of the building and by a window. Skylights can bring sunlight into your office, as well.
• Look to purchase and install energy efficient lights with the highest CRI available. If your office continues to use fluorescent lights, then consider electronic ballasts over magnetic ones (less flicker) and “full spectrum” lights that have a better CRI than others or filters over lamps to aid in full spectrum wavelengths.
CCES has the experts to help you evaluate your lighting to save energy costs, while creating a positive working environment. Contact us today at 914-584-6720 or at karell@CCESworld.com.
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