John Rumm wrote:
David M wrote:

There must be a batch of _very_ low efficiency 50W bulbs going about,
is all that I can think. :-)


The response of the eye is non linear anyway, so to get illumination
that looks twice as bright as 50W you will need way more than 100W.


Yes the response of the eye is fairly complex, and the point you raise, is
another good argument why many of the posters, with a couple of hundred
Watts worth of bulbs in a small space, probably would only see a minor
reduction in the effective lighting if they halved the wattage.

cheers

David