The average U.S. household includes 51 lightbulbs. Assuming all of those bulbs are 60W incandescents, over 22 years (a common estimate of LED-bulb life spans), you would save roughly $6,942 in energy costs by replacing them with output-equivalent LEDs. Factor in the combined price of the more than 800 incandescents you'd need to stock up on during that period (since most burn out in 1.4 years or less), compared to buying just 51 LEDs, and the total estimated savings for going all-LED comes to $8,639. A number that large is simply too hard to ignore. With all this in mind, we tested dozens of bulbs to find the ones that will help you make the right swap in any socket.
Nanoleaf 12W LED
Best for Maximum Life Span
All LEDs are energy efficient, but the Nanoleaf's folded-design goes further. The tactically positioned diodes and perforated frame avoid the need for external heat sinks, making it the most efficient 100W-equivalent bulb by a mile (36 percent less electricity than the Philips). The light is a bit harsh, but put it under a shade and you can forget it for 27 years. [$50; amazon.com]