Quote Originally Posted by userfriendly View Post
I looked at the GES 7 watt led while in True Value. Lumen rating is 810 lumen. I looked at the CFL's to compare lumens. Turns out GE 14 watt CFL is also 810 lumen. The 18 watt cfl was around 1000 lumens. So based on the lumen ratings, the 7 watt led is only equal to 14 watts CFL and not 23 watts as claimed by the manufacturer.

Is there a difference on how they test?
I know they can squeeze more lumens out of CFLs for a given Watt. However, they usually do so at the expense of decreased operational lifetime. A few of the CFLs we used to have would start to burn and melt towards the end of their lives.

FWIW, the spiral type CFLs produces more light than the traditional 'straight' ones but usually costs more.

Several months ago, I compared four light bulbs that can be seen in post 36 of this same thread: http://tsikot.com/forums/science-tec...ml#post1989530