It is a intelligent lighting controller. It allows me to control 50 ballasts per channel, and it has 2 channels for a total of 100 ballasts.
I can turn on or off all the lights to the second.
The controller comes with 2 external temp sensors to be placed in two rooms, or two different locations in the same room. The controller monitors the rooms temp, and is programmable. You can enter a max temp value that will start to shut off ballasts if the temp gets to hot.
I can control the % of the wattage. My 1000 watt ballasts can be turned up to 1150watts.
It has a soft start. The controller will fire the ballasts from anywhere from 4-15 seconds apart so you don't have a large load all at one time. This feature is really great.
I grabbed this from my China supplier for $186usd.