That's now solved by stating the actual light output in lumens as well as the power consumption in Watts (and it should have always been thus).
Essentially, every compact fluorescent and LED light bulb I've bought in recent years states both the power consumed and light output (which means that if one bothered one could calculate the overall efficiency of the bulb).
Also, for those who still have difficulty with the new specifications, manufacturers state the new bulb's light output to be equivalent to an incandescent of 'x' Watts
(i.e.: the light output of say a 20 Watt compact fluorescent ≡ to a 100 Watt incandescent bulb). This is now rather irrelevant where I live as incandescent bulbs have been banned for so long that everyone has forgotten about them.
Essentially, every compact fluorescent and LED light bulb I've bought in recent years states both the power consumed and light output (which means that if one bothered one could calculate the overall efficiency of the bulb).
Also, for those who still have difficulty with the new specifications, manufacturers state the new bulb's light output to be equivalent to an incandescent of 'x' Watts (i.e.: the light output of say a 20 Watt compact fluorescent ≡ to a 100 Watt incandescent bulb). This is now rather irrelevant where I live as incandescent bulbs have been banned for so long that everyone has forgotten about them.