In typical U.S. commercial buildings, lighting accounts for close to 35% of electricity usage.
We continually monitor new LED products to the market for all applications and hone our lighting skills. LED bulbs and fixtures are very commercially viable for building retrofits or new construction. They can be used for LEED or other building certifications. In most cases they can cut lighting bills by 50% or more.
Based on the amount they can save, LEDs are nothing short of a revolution. In some cases they are exceeding the savings of a solar electric system. However, it shouldn’t be one or the other. The two together can really make a large impact on electrical usage.
One of our customers, David Kerr Violin, originally used 36,000 kWh per year. We maximized his roof with the installation of a 6,500 watt solar system, and saved approximately 7,000 kWh per year or a reduction of 20% off his electric bill.
However by retrofitting all the lighting with new LED bulbs and fixtures we decreased his usage by 7,839 kWh per year. By decreasing his bill with LED’s the solar contribution increased to 25%. Together the LED plus solar reduced his electrical usage by 41%. The perfect integration of technologies.
Color Quality: Two color metrics when evaluating the color from a light source.
CRI – Color Rendering Index: Is the ability of a light source to produce color in objects. The CRI is expressed on a scale from 0-100, where 100 is the best in producing vibrant color in objects. A CRI of 80 or more is considered excellent in most interior lighting applications.
CCT – Correlated Color Temperature: Is measured in Kelvin or degree K, accounts for the color appearance of light sources. All lamps emit ‘white light’. The higher the color temperature, the cooler or bluer the light. The ‘right’ color temperature varies with the application.
Unlike incandescent or fluorescent lighting LEDs usually come with a minimum of a three year warranty. Yes–a warranty!
Lamp is a bulb.
Luminaire is a fixture.
Lumens are the new watts. The total quantity of light emitted by a lamp.
Lumens per watt. Often referred to as efficacy, measures the amount of light delivered per watt of power. Today’s technologies deliver three to four times more lumens/watt than incandescent lamps.
Lumen maintenance refers to how a lamp maintains its light output over time. A lamp’s lumen maintenance factor is the percent of the original light output that remains when the lamp has reached 40 percent of its rated average life in hours.