400 watt Dimmable Ballast for Grow Light

Changing my garden size so I am looking to sell my brand new 400 watt ballast. In box with all cords included. Used once to test and it works great.
This unit is dim-able, meaning it can be run at 50% (200 watts), 75% (300 watts) or at 100% (400 watts).
The ballast is digital, meaning it accepts both HPS and MH lights.
This unit is brand new. I am asking $80, email with any questions!
If the ad is up, it`s still available.