Sounds abnormal to me. I have a dual 400w TAR ballast and it's dead quiet. Is it from AI, J&L or another supplier? I'd let them know, maybe get a replacement.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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