Need to buy/make a dimmer for a 750 watt stage lamp.

My first thought is to just use a dimmer from box store and slice up an
extension cord and splice it in. That is assuming they have dimmers
to handle that load.. it would be easy to find a cord that would handle
that load.

Do they make 1000watt+ dimmers?

Is there a better solution. (light must be mounted about 25 feet away
from nearest power source, so need some bit of cord run.)