So I need portable power because I'd like to start using my lights on location. Today I bought the Motomaster Eliminator Powerbox 800 and I'm trying it out just now. I charged it and I tested my lamp and my heater - both work perfectly. Then I plugged in one of my Opus Studio lights. It works. It powers on and functions, but it audibly buzzes. This box's outlets are 120v AC, and that's what these lights require, so what's going on? Is this dangerous? Am I going to fry these lights?