Just wondering if someone could perform the experiment with one LED "bulb" and two DMMs -- one in series with the device and the other in parallel -- measuring current and voltage?
That would only tell us the VA, not the power. Hence why c6em's question re PF. Would still be of interest, mind.
Worth stressing above all though, since the demise of 'proper' light bulbs, I pay more interest to the luminous flux, expressed in lm, regardless of wattage.
Another important parameter, largely unique to LED bulbs, is the beam angle, which is often quite narrow. Many LEDs contrive to 'throw' all the light forwards, away from the base. For a downwards hanging pendant that may be well as it shines onto the floor and walls but, for an upward facing bulb on an external wall lantern, it just lights up the sky.