The only problem is it needs to be driven by a low current low voltage signal.
That's not the only problem, it's the least of the problems!
It's nominal 208W with a pristine cooling arrangement that's only available in a research facility (think liquid Helium).
For common use, a good rule of thumb is 1/3 of it's nominal max. power i.e. 70W absolute max. and that still needs a hefty cooling arrangement.
With a current draw of 5A, it means it can be used down to 14W under the max. rating of the mains voltage and up.
120VAC + 10% is 132V, so the possible area would be 118V to 132V (@5A).
But the real problem here is IMO, that if you have to ask about something, you must be inexperienced in that field, which is a very bad thing when you want to play around with mains voltage.
If you don't really really really need the noise free dimming that this approach can give, go with a phase angle control instead.
And remember to allways keep (at least) one hand in your pocket when working with mains.