Modern LEDs yield more lumens per watt, or reduced wattage, compared to other light sources such as incandescent bulbs and fluorescent lamps. That’s because they are better at controlling light than alternative sources and even previous LEDs. Plus, there’s no light lost; in fact, today’s LEDs are just as luminous as other, more energy-hungry sources.
The more lumens per watt (lm/W), the more efficient the lamp, so lumens per watt is a measure of the energy efficiency of lighting. Here’s another way to look at it: various light sources, like LEDs and incandescent bulbs, produce a certain amount of visible light using a given amount of electricity. For example, a common 60-watt incandescent bulb produces 860 lumens. That means that for each watt of power, the bulb produces 14.3 lm/W. A comparable LED luminaire might produce 300 lumens using just 10 watts of power, equaling 30 lm/W. This means the LED luminaire can produce more than double the amount of light using one-sixth the amount of energy.
Increased LED efficacy creates opportunities for not just energy savings, but also smaller, more affordable lighting solutions and a broader range of designs.