Timothy Murphy wrote:
Tesco are just selling sets of 3 11 watt energy-saving bulbs very cheaply,
and these claim to give 600 lumen,
while a "soft tone" Phillips 60 watt bulb specifies 710 lumen,
which seems a little low by your measure.

Soft tone is less efficient than pearl - the more diffusing the glass
the more light it absorbs, and also the slight tint of soft tone is
caused by absorption of light. Opal is worse than pearl but better than
coloured soft tone, clear is more efficient than any of the others (but
of limited use of course).

All this assumes that you have the same filament, gas fill etc.


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