Dimming function

I currently have a system with 10 bulbs at 150 W each. They run on 28 V (max). A variac steps down the 115 VAC and allows the lights to be dimmed. I wanted to convert to a system that completely uses solid state components instead of the variac. The dimming function must be able to be controlled through a computer. Is there any circuits or COTS components that anyone could recommend? Thanks for any help.