The countless gongs to this company's name include Time Magazine's 50 Best Inventions and an Edison Award, so when it comes to planet-saving illumination, they have few peers. Thanks to their unique liquid cooling system design, Switch LED Light Bulbs promise to last up to 25 times longer than their regular counterparts, that adds up to 25,000 hours. For each one you buy expect to save around 130 bucks over the bulb's lifetime. Plus, you'll be doing your bit to look after the Earth.