[BC] to fluorescents

[WFIFeng at aol.com]

In a message dated 10/30/2007 8:32:30 PM Eastern Daylight Time, 
nakayle at gmail.com writes:

> Modern fluorescents use electronic ballasts which operate at
>  frequencies so high there is no discernible flicker.  Of course there
>  are still a lot of magnetic ballasts around but they are rapidly being
>  phased out along with the old T12 style bulbs in order to meet new
>  efficiency requirements.

Because the power supply filter caps inside these things are always too 
small, you still get 120Hz flicker, just not as much. The easiest way to tell is if 
you still have a turntable with the "strobe" rings. If the "dots" are clearly 
defined under the florescent lamp being tested, you have a fairly strong 
flicker. If they are "smooth" then there is less flickering. If they are 
completely indistinguishable, then it's using a properly filtered supply, and running 
at a very high (non-visible) frequency.

Willie...



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