IC Eletronic ballast is a HQI ballast. I have IC ballast, and I also have the 250W/400W DE pendents made by IC. I have been happy with both. I really do not know the true numbers though which is better.
I love my ICECAP ballast and have heard good things about the IC mini pendent. While either will suit your purpose, IC's excellent customer service is the deciding factor for me.
what you need to do is look at the color of the lighting of each ballasts as each one will either make the same bulb more blue or yellow. You might not like the color put out by that ballast if you have not seen them in person