How do you select LEDs since we are not used to thinking in lumens?
May 6, 2013
When the only light bulbs we knew were incandescent, wattage was an okay method to think about brightness.
But when alternatives like fluorescent and LED became more popular, that gauge no longer made sense.
If you've purchased CFLs, you know that a 23 watt CFL is roughly equivalent to a 100 watt incandescent. That reflects the fact that CFLs are about four times as efficient – they use a quarter of the electricity to make the same amount of light. LEDs are even more efficient.
Selecting a light bulb
What we really want to know in selecting a light bulb is, as you mention, its lumen output. Actually, that's not entirely true. We want to know its lumen output as well as its wattage and a few other things that tell us what the quality of light is.
In terms of brightness, though, here are some rules of thumb, courtesy of CleanTechnica.com, for buying replacement light bulbs:
It's only when we know both the wattage and lumens of a bulb that we can know both how bright and how energy efficient it will be.
Fortunately, all this information – as tedious as it may sound – is fairly easy to come by.
Look for the Lighting Facts label
More and more light bulbs include a "Lighting Facts" label on their packaging.
Article Provided Courtesy of USGBC