Guitar processor noise...? BZZZZZZ!

fluorescents....I have a O-scope in the garage under 8 F40CW bulbs. Those are noisy for sure. I turn them off and use the LED flood over the bench when I'm scoping. Them wall wort DC convertors are crap too. I had one running a cheap signal generator and my scope went crazy, even when it wasn't looking at a signal. Unplugged it...flatlined the scope trace back to normal. Probably a leaking filter cap in the PS.