DGP
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Square wave ballast.i think it's different than other digital ballast.
Magnetic ones are definitely noisy. However, most of the digital ones are as well and they often put regulatory agency approvals on them even if they didn't f'ing pass the tests. One of the few I have tested that are acceptably clean are Galaxy. I used a spectrum analyzer and looked at a bunch of different ballasts and that Galaxy was it.
Dee