Quote Originally Posted by Montmorency View Post
Why do you say that? Your citing of the metric offers no context to what we make of the sun - and note that with respect to the sun the wattage component of the efficacy apparently refers to the radiated heat rather than direct source electrical consumption or conversion.

No, what you have cited goes toward evaluating some lamps against others in generation of light. Don't misuse metrics in response to a criticism of the misuse of metrics.
Personally, I think you are trying to avoid admitting that your original comment was sloppy in its wording. This isn't the backroom though, so I don't want to push this thread into a more combative discussion.