Why Does Over Kitchen Sink Fluorescent Use More Watts Than Bulb Says
While trying to post this question I got directed to a similar question re a Kill-a-watt meter that answers my question too. The bottom line seems to be that these inexpensive meters, like the Kill-a-watt, Reliance Controls THP103, and Efergy Elite will not accurately measure the watts for a CFL because they compute the watts by multiplying amps times volts whereas the power company meter measures watts directly. The former does not take into account the power factor, whereas the latter does.