Justin Stouch, Stouch Lighting
Retrofitting your current lighting with an energy efficient LED solution can save you up to 80% in annual (recurring) energy costs. The savings are so significant that you can finance the replacement of your legacy lighting with the cost savings you will realize from retrofitting your facilities with modern LED technology. When evaluating energy savings from advanced LED lights it’s important to understand energy terminology, financing options to ensure cash flow positive LED conversions, and to see the results from past projects where LED lighting has been successfully implemented in place of legacy solutions like fluorescent, incandescent, high pressure sodium, mercury vapor, or metal halide lighting. We’ll cover all three instances in sequence to give a comprehensive discussion of the energy efficiency advantages available with LED lighting.
The Basics: Energy In Terms Of Electricity
The first thing you need to understand is what exactly energy is in terms of lighting. There are four basic measures you need to be aware of:
For more on joules, watts, kilowatt hours, and lumens/watt read here. For more on luminous efficacy read here. Other, more advanced metrics that further define energy efficiency in lighting include useful lumens and foot candles. The basic difference between luminous efficacy (lumens/Watt) and useful lumens or foot candles (lumens/Watt·ft2) is that the former describes the total amount of light emitted by the bulb while the latter describes the amount of light emitted in the relevant target area.
For example, a fluorescent light mounted on the ceiling will emit light for 360 degrees (including useless emissions into the ceiling itself). Some of this light can be reflected and/or redirected but much of it is lost meaning the energy used to produce it (kWh is wasted. This light will have high luminous efficacy (total light emitted) but lower useful lumens and/or foot candles (total light emitted in the desired target area). An LED light, by comparison, emits light directionally (only 180 degrees) meaning there is no wasted energy directing emissions towards the ceiling instead of the room being illuminated. The light that better directs its emissions will have a higher measure for useful lumens. Because LEDs are directional they will surpass the efficiency of an equally capable omnidirectional (360 degree emitting) light of equal capability.
Advanced: Financing Your LED Lighting Retrofit With Energy Savings
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