if in their description they say on for 10hr's per day then yes about 40w... but does the reading take into account the time it's in standby mode or is that after it get turned off at the power point..
Juergen
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All smoke and mirrors to make it sound good from a marketing perspective.
Somewhere on the back of the unit, or even in the handbook, you should find a rating, either in amps or in watts. This would be much more meaningful. If in amps, then you also need to find a voltage. Watts = volts x amps (near enough anyway for this exercise).