9 weeks under 250w HID. What strain, indica or sativa. Most indica's take anywhere from 8 to 10 weeks. Sativa's take longer, around 10 to 12 weeks. I would definitely let it go another week, especially since you only had 250w HID.

If you have a local Radio Shack go there and get an Illuminated Microscope: $12, Attachment 283490, and use it to check your trichomes. That's the best way to tell if your plant is mature.

Happy Harvest!!