In article ,
"Owain" writes:
"froggers" wrote
| Can anyone tell me what the typical lumen outputs of "normal" mains
| 40W / 60W / 100W bulbs are or a website ?

Referring to my "Mechanical World" Electrical Year Book the output of a lamp

What year is this? Looks like 1920's from the lamps listed...

Table IV Typical lamp efficiencies

Lamp / Lumens per W / W per MSCP

Carbon fil, ordinary 3.0 4.2
Carbon fil, metallised 6.0 2.1
Nernst 8.5 1.5
Tantalum 8.0 1.5
Tungsten, vacuum 7.5-9.5 1.65-1.3
Tungsten, gasfilled 10-20 1.25-0.65
Open carbon arc DC 15 0.85
Open carbon arc AC 7 1.8
Enclosed carbon arc DC 9.5 1.3
Flame arc open DC 40 0.32
Magnetite arc 25 0.5
Tungsten arc 12.5 1.0
Mercury arc (in quartz) 55 0.23
Neon arc 25 035
Moore, N/CO2 8.5 1.5
ditto 3 4.2
Neon glow discharge 0.85 15

Low pressure sodium -- 180 Lumens per Watt for the larger lamps

--
Andrew Gabriel