Jerry Built wrote in message .. .

It's easy with freezers and suchlike - but I've seen "energy
rating" on incandescent light bulbs - I would thought WRT
these a light bulb is a light bulb is a light bulb. However,
perhaps the thickness of the filament varies, or something.


This is so people can compare to the better bulbs. But there are wide
variations, particularly with foot long filament tubes, which are
truly abysmal. Lesser variations extist between coiled and coiled coil
filaments. Also halogens and non halo differ a fair bit.


Regards, NT