Here’s three reasons why LED lights matter

To put white LEDs in perspective, we can benchmark them against other common light sources, such as compact fluorescent (CFL) and incandescent light bulbs. A simple way to compare their efficiencies is by measuring how much light they put out (measured in “lumens”) for every unit of electrical power pumped into them (in watts). The best white LEDs generate about 300 lumens for each 1 watt input — far more than CFLs (70 lumens per watt) or incandescent bulbs (just 16 lumens per watt).