空中英语教室：201101120 MP3在线课程 Innovative Eco-friendly Products
LED light bulbs
LED is the newest alternative to the current, energy-efficient fluorescent light bulbs. But unlike fluorescent bulbs, LED lights contain no traces of the toxic element mercury. They are even found to be 5 percent more efficient than fluorescent and possess a life span of up to 50,000 hours! Purchase costs may be high, but only LEDs can say they will still be glowing 20 years from now.
LCD is nothing new liquid crystal display was first discovered as a technology in 1888. But these days, LCD is the standard in energy-efficient TVs. The past year offered up numerous improvements that are determined to save watts and bucks. For one, human presence sensors prompt the TVs to shut off after 30 minutes when no one is in the room. Additionally, illuminating backlights dim and brighten depending on the lighting present in the room. To cut off power completely, just flip a switch on the back
panel to avoid paying for that energy use spent in "sleep mode." All of these are just some of the many ways LCD has once again redefined efficiency.