beenthere said:...I just shuttled 5 (36 cell flats) out to the garage and I'm pretty sure I'll not want to do that again. Heavy, they are.
It's definitely a lot of work and bother, and I wondered about that, but it sounded as if you were determined. Rereading your post, I understand now that the light tables were in the house, and these plants aren't going back there.
The "extra day-length lighting combined with bright days outside" was a trick I used last winter when I started some seed in the fall and tried to maximize their growth over winter. I only had 3 grow bags to shuttle, with 6-8 seedlings per 1-gallon bag. Without running a control group I couldn't say how much difference it really made, except that they were really husky and definitely "pre-hardened" when it came time to leave them outside. The biggest problem was spider mites, which thrived in the dry indoor conditions.
Your seedlings will be happy out there. Plants grow longer, wider leaves in an attempt to compensate for lower light intensities. Under the sun, the top growth will be stocky, so they might not appear to be growing as fast as plants under lights, but they're growing "better", with thicker crowns and more roots.