Exactly...if not used properly.
There is nothing dangerous about the plugs or controller. What can be dangerous is someone putting one in or using one and not understanding what it does/puts out. But that is not the controllers fault for doing exactly what it supposed to...send whatever voltage is wired to it, regardless of plug. You can wire into to 120v if you wanted to.
Guns don't kill people...people kill people.
Light controllers don't plug wrong shit into them...people do.
Access to poor decisions is just easier I guess.
When used correctly...they are as safe as anything. Many 120v cords use lower gauge wire for the higher currents at that voltage...and becomes extra safety on 240v.
So to be more clear...I am talking about the kilowatt meter being plugged into the 240v via the plugs...because his ballast is 240 wired that based I what he said, I am assuming hard wired/not changable and needs to be on 240v. But the meter will read 240v fine and safely...it was just designed for US households, that are 120v standard. But the kilowatt meter it self is not talking any of the load...only reading it and was will do either. I looked into it as much as I could through every published and taking it apart. Then actually tested it my self. And of course paid attention while doing it.