I recently purchased a wattage meter and tested these store bought CFLs and here are my results:
~100hrs use
Lights of America 26W 5300K (1) - 25W
Lights of America 26W 5300K (2) - 25W
~1000hrs use
Bright Effects 65W 2700K (1) - 60W
Bright Effects 65W 2700K (2) - 47W
General Electric 26W...