Yes electronic ballasts are quieter then magnetic, but i like that buzzzzzz sound. My cooper strip light had a GE Proline electronic F40 RS ballast in it. Seems like Cooper doesn't make their own fluorescent ballasts, which is probably for the better....
sylvnaia ballasts are good stuff, we use them at school ...sure they fail but not as often as others and whats the code on the Altos? the Alto 2 lamps are great exempt 2008-2009 were junk years lol