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Understanding LED Lighting
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Understanding LED Lighting
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The importance of accurately measuring the light emitted from a LED light bulb has been highlighted by the frequent overstating of light levels (intensity or outputs in lumens) by various suppliers as well as the variability in the colour of the LED light known as colour temperature. Understanding the measurement units of LED light is the first step in understanding the product and whether or not that product is suitable for you. Aside from knowing that the LED light bulb or luminaire is going to do what the specifications state, the other important area is knowing what sort of LED light you need to create adequate ergonomics including good visibility or a comfortable environment whilst maintaining a high level of efficiency. After all you are changing to LED lights either because of the energy saving advantage or the long life of the product. Nevertheless you want the LED lamp to do what your old lamp did for a fraction of the running cost and if possible you want it to do an even better job at LED lighting your home, office, factory or shop. In this section we will examin the following LED light measurement and concepts:
For a more general overview you should read the LED Buying Guide Checklist and associated important sections including "Passive Cooling Methods" and "Critical Design Elements" in the LED Buying Guide.
Alternatively you may wish to read the US Department of Energy's publication on LED Frequently Asked Questions.
References and Further Reading:How is LED lighting different from other energy-efficient lighting technologies? In Solid State Lighting, LED Basics. US Department of Energy. www1.eere.energy.gov Energy Efficiency of LEDs. Building Technologies Program. Solid-State Lighting Technology Fact Sheet. US Department of Energy. www.eere.energy.gov LED Frequently Asked Questions. May 2011. US Department of Energy. www.eere.energy.gov New Reasons to Change Light Bulbs. March 2013. The New York Times
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