400w Venture Ventronic Electronic Dimmable HID ballast

1 x 400w Venture Ventronic electronic and dimmable ballast for 400w high pressure sodium and metal halide lamps.

Dimmed power is 50% or 200w.
The dimming conductor needs to be tied to the mains for full power operation.
Powering on with the dimming lead floating results in the lamp running up to full power as normal and then slowly dimming down to 50%.

Interestingly, all my other electronic HID ballasts for 20, 35, 70, 100 and 150w lamps run at around 150hz. This unit drives it's lamps between 114 and 120khz.