K8003 dimmer for 1000W lamp

I’m using a velleman k8003 dimmer to dim a 500W lamp via voltage control from my modular synthesizer
the manuals says this can dim 750W lamps,
Can I use or modify the circuit to dim a 1000W lamp?
The dimmer won’t be used longer than one hour.

velleman.eu/downloads/0/manual_k8003.pdf

I’d like to keep usiong this circuit, but other tips for voltage controlled dimmers are welcome too.