In article om,
"dennis@home" writes:


"Andrew Gabriel" wrote in message
...

8

Standard filament lamps - it makes almost no difference to life
how frequently they're switched.

That is untrue, tungsten filament lamps wear out far quicker if you keep
switching them on and off.

Not true for Standard filament lamps - don't confuse the tendancy
to die at switch-on with a reduction in lamp life due to switching;
there is virtually none and it's a common misconception. What happens
is that for the last ~5 or so hours of life, the lamp won't survive
a switch-on, so if it's on for less than 5 hours at a time, its
end-of-life failure will be at a switch-on.

Some geometry of halogens (larger ones) can be impacted by switching
(those where the quartz envelope doesn't get up to operating temperature
during the "on" time), which is why I specifically said Standard filament
lamps.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]