Posted by johnlankes on
URL: https://www.es-forum.com/lights-tp1542111p1542189.html

If a fluorescent light flickers when it's turned on, it has an old-

style 60 hertz ballast. If it doesn't flicker it has the newer, energy

efficient "electronic ballast" type that oscillates at a frequency of

20,000 Hz. If this 20 kHz signal is not adequately shielded, can be

problematic for us.

Since manufacturers in the U.S. are only concerned with FCC regulations

(for radio interference), shielding is not a priority.

Once again, if there is no perceptible flickering, it's the higher

frequency "electronic" type.


John Lankes