On Nov 26, 8:58*am, "John" wrote:
It is a pity we are 'stuck' with relating brightness to wattage. If we used
a proper definitive measure of brightness then manufacturers would have to
be more honest.
Brightness is something that can be properly measured with a calibrated
instrument. Relating everything to a poor performing incandescent is not
good science.

(Lux - Candela - Lumens - whatever)

Here in the US all packages at stores I go to have lumen and watt
printed, If you want to compare Lumen hold a pack of incandesants and
compare. I just figure Cfls output 75% more in my shopping. If you
want to get technical to find the most efficient use you calculator
and run LPW a Lumen Per Watt number. For new types I just use Watts
and LPW as my guidline as some new cfls are 80% more efficient than
standard incandesants.