darren, the bulb is switching at 50Hz or 60Hz depending where you are in
the world, as are CRTS, hence the flicker. If you turn the bulb off and
swing it, no flicker. 

The frequency at which a flickering source is perceived as continuous
is called the flicker fusion frequency and starts to kick in around
16Hz though varies with brightness, fatigue and even the bit of retina
the image falls on, which is why some people can notice the flicker
from stataionary tvs when they are on the edge of their visual field.
The flicker is really there.


-- 
JezA
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