CFL equivalence
The claim is made of Compact fluorescent lamp (CFL) energy saving light bulbs that a CFL bulb rated at 11W has the same light output as a 40W incandescent bulb.
However different brands seem to have different levels of efficiency so some rate 11W to be 60W equivalent, while others claim only 40W equivalent.
The trouble of course is caused by the fact that light bulbs seem to be generally sold based on the amount of energy that goes into them rather than the amount of light that is produced.
If the manufacturers would switch to advertising the output in the correct unit (Lumens) the problem would go away.
Biting the hand that feeds IT
