Thanks to My Green Montgomery (Maryland) for this wonderful chart and explanation:
Compared to less-efficient incandescent bulbs that emit light everywhere, LED light bulbs more efficiently emit light in a particular direction. What needs to be lit will still be bright, just without wasting energy.
LEDs are versatile and can be used in a variety of lighting situations. They use far less energy and last significantly longer than other light bulbs (for approximately 50,000 hours). If used for 8 hours a day, an LED bulb could last more than 17 years! For “Going Green,” this means less energy and materials will be needed for replacement bulbs.
For fuller explanations, and answers to questions you might not even know enough to ask, read
• Light up your home with LED light bulbs
• Connection between craft brews and LED light bulbs