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It doesn't offer any real advantages over other methods and can be a significant cause of EM interference so it isn't adopted commercially.
It did occur to me that a saturable inductive ballast might be used with LEDs though. I have not seen anyone using it but it might work. Basically, you rectify the AC mains and feed it to the LEDs through a specially constructed (but small) inductor which limits the current to the minimum you want for lowest light output. Then using a DC control current through an independent winding, you saturate the core so it's effective inductance drops and it presents a lower XL to the current flow and hence brighter LEDs. It draws a symetrical current from the AC although it may not be sinusoidal and it produces little EMC. May be worth following up.
Thanks FvM......great thread....blimey, so this induction lamp ballast thing is some industrial secret.....i wonder what is the switching frequency?
Presumbaly its fairly inefficient?
Sounds like a radio transmitter.
Thanks also Betwixt...sounds good, and very efficient..
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