in my experience, a 2xT12 ballast is MAGNETIC, not ELECTRONIC, as is ALWAYS needed in ODNO... The marking of 40w is another indicator that it's the wrong ballast. Electronics are in increments of 32w, not 40w. if the ballast doesn't specifically say ELECTRONIC, then you're asking for trouble. If it *is* an ELECTRONIC ballast, then I'd double check my connections for accuracy, and toss that ballast for sure, because any ballast that has been hot enough to start smoking is no longer safe. Best of luck, and be safe.
Eheim Pimp #171
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