With lighting accounting for more than 19% of the worlds total energy consumption having the most efficient light source possible becomes vitally important.
Now is the time to make a change to our lighting vocabulary. Moving away from the familiar watts toward what really matters the amount of lumens for a given light source.
Lumens per watt is a measure of how much visible light you get for a given amount of electrical power. Some have compared it to mpg of a car it is a good indicator of how much bang you are getting for your buck.
Luckily it is as easy as 1,2,3 to work out here is how.
Lumens are the amount of light produced by a bulb. Find the number for lumen output on the light bulb’s box.
Wattage is the amount of electricity needed to light the bulb. The higher the wattage is, the brighter the light will be. You can find the bulb’s wattage written both on the box and on the bulb itself.
Divide the light bulb’s lumen output by the number of watts the bulb needs. For example, a 100-watt light bulb usually has 1800 lumens, so the LPW is 18.