On Sun, 30 Aug 2009 18:32:21 +0100 someone who may be ernie mendoza
wrote this:-

i have a wall switch that turns on the light when it gets dark and
turns it off after several hours. are there energy-saving bulbs that
would work with this kind of switch?

Depends on how the switch works. If it has a neutral connection then
all should. However, if it doesn't have a neutral connection then it
works by passing a small current through the lamp. This can't be
seen with a filament bulb ass it doesn't make the filament hot
enough. With a CFL it may make the lamp flash occasionally, with a
LED it shouldn't do anything.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54