On 1 Dec 2006 04:57:15 -0800, wrote:

Clive Mitchell wrote:
In message , Andy Wade
writes
wrote:

There is also Victor's point about flicker, but really if a light is
flickering noticeably its replacement time anyway, so its not such an
issue in practice. It is in large lighting installations though, where
faulty fittings are liable to be left running. But as long as its
working ok, there isnt a problem.

Unless stroboscopic effects in connection with rotating machinery are a
problem.

I believe it's in the kitchen, so there is a high possibility of putting
ones hand into the seemingly motionless cake mixer. :P

machinery strobing is possible with mag ballasts, but doesnt normally
happen,

actually it happens 100% of the time on single lamp
ballasts, through it is usually called flicker.

and does not make it look stationary even when it does.

Since the depth of the modulation is less than 100% and it
is unlikely that the mixer blades are rotating at a multiple
of the power line frequency I agree with you on this point.

Its not as much of an issue as is often thought, even in workshops.

I would agree about the effect of the strobing on rotating
machinery.

In a house its a non issue.

Unless you are one of the many people who get headaches from
fluorescent lamp flicker.

And cake mixers are well interlocked

And where do you find a mixer that is interlocked against a
hand in the "blades" or whatever they are called? Certainly
not mine.

--
Vic Roberts
http://www.RobertsResearchInc.com
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