Most Energy Efficient Light Bulbs

Most Energy Efficient Light Bulbs

A Guide to Light Bulbs


Light bulbs can put out different levels of lighting and expel various amounts of energy. Here is a simple guide to understanding light bulbs.

Light Bulb Definitions


Illumination: The light distribution on a flat service.
Footcandle: The illumination intensity.
Lumen: The amount of light given by the bulb.

Different Lighting Types


Warm lights give off a soft, warm white tone. This is good for bedrooms and living rooms. Cooler bulbs have a more crisp bright white which is ideal for kitchens and bathrooms.

Traditional Incandescent – Uses 10-17 lumens per watt and good for 750 to 2,500 operating hours. It produces more heat overall than actual light and is slowly being phases out of the marketplace.

Company Fluorescent Lights (CFLs) – Uses 30-110 lumens per watt and is good for 7,000 to 24,000 operating hours. These use 75% less energy than incandescent.

Light-Emitting Diode (LED) – The lumens per watt vary and have a 25 times longer life than incandescent bulbs. These are considered the most energy efficient bulbs on the market right now and use 75% to 80% less energy than incandescent.

Operating Costs


The annual operating costs of an incandescent are $4.80 while a CFL bulb costs an average of $1.20. The operating costs each year for a LED is $1.00. Replacing 15 incandescent bulbs can save homeowners $50 each year with an energy savings that will offset the purchase price of new bulbs in 9 months’ time.
Posted on Sep 04, 2013

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