Lumens 
 
 
Lumens measure how much light or brightness you are getting from a bulb. With CFLs, the lumens will be the same with a 60 watt equivalent even though the Kelvin (K) temperature may be different. A 2700K CFL, a warm or soft light, has the same lumens as a 6500K CFL, or a day light bulb.

The lumen levels of the lighting in your home may vary widely. To help consumers understand comparisons of watts to lumens, a new product label for light bulbs will clearly provide this information. The label will estimate the operating cost for the year and the color of the light from warm/yellowish, to white to cool/blue.
 
Here are some helpful tips when replacing and purchasing bulbs:
  • Replace a 100-watt bulb with a CFL of about 1600 lumens
  • Replace a 75W bulb with a CFL of about 1100 lumens
  • Replace a 60W bulb with a CFL of about 800 lumens
  • Replace a 40W bulb with a CFL of 450 lumen
 
Learn More from the U.S. Department of Energy Website
daylighting, skylights
 
 
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