Aw yes, the ol' 2 yoyo technique. To be outdone only by the 3 hot wheels set up.

I've got to know why you went with HID for seedlings instead of something a little less... drastic, like fluorescent. I've found that my seedlings don't like HID light unless it's a mile away. Also is that plexiglas around them or what? Is that to help keep the warmth and humidity in?