Doing some private research into the suitability of various low-energy lamps, I investigated the current thinking on the specific output of incandescent lamp bulbs.
I found the following in Wikipedia. 'A standard 100W incandescent light bulb emits approximately 1,700 lumens in north America and around 1300 lumens in 220V areas of the world.'
Does anyone know why this should be, please? Has any research been done into the optimum voltage for the best efficiency of incandescent lamps?
Brian Hammond
Lichfield
Staffs
Can you shine a light?

Water Sector Talent Exodus Could Cripple The Sector
Maybe if things are essential for the running of a country and we want to pay a fair price we should be running these utilities on a not for profit...