"Andrew Gabriel" wrote in message
...

8

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.

Thermal shock each time you switch the lamp on will reduce its life.