@wide-lite 1000:
These reflectors won't work, they are designed for a small cylinder of the halogen filament.
The HPS is significantly larger and way-way longer, so the focal length would need to be made larger as well.
Dunno what diameter is the 1kW HPS burner, my guess would be something nearing 10mm or so.
For a 10deg high beam it would mean about 6cm distance from the back of the parabole, so at least 30cm high reflector.
I think for the 10deg beam, we are talking about size and accuracy in reach for DIY, assume you have at least some basic wood/metal (hand saw, drilling,...) home workshop...