I think it's way too early to move your plants outside unless you can heat that greenhouse to stay over 40 if it freezes. I would keep them as cold as possible down to 40 to slow their growth and get 4' T8 fixtures with 6500K tubes - as many as you need to have each plant under one. Keeping them cool will slow their growth but using the lights will keep them from putting out lanky, weak growth. Water as needed but not more. No fertilizer. You only need this for 2 months (per year) so get the cheapest fixtures you can find. I'm using lights of America 2 bulb fixtures that were on sale for 8.99 right when I needed them. Their regular price is only 11.98 so they're still not too bad.
Lowe's T8 bulbs are cheaper than Home Depot's, but HD's CFL 4 packs are much cheaper than L's. Clamp lamps for the CFLs are cheaper at L's. I can get 7 6.5" pots under 1 fixture (the ends are dimmer so you can't use the whole 4'), 21 under 2, 30 if I use 2 100W 5000K CFLs to fill in the central shadow and space them further apart. This makes HD's resin shelves work really well. I put 2 18x36 units together to make 36x36, use 2 poles to space the shelves far apart and hang the lights from the shelf above. In this unit I have the top lights hanging from some PVC because the bottom shelf is short for rooting cuttings. In the next unit all the shelves will be far apart and the top will be for rooting cuttings. Works better, I think. You have to unscrew the reflectors from the clamp lamps. The heat buildup fries the CFLs in under 1 wk. Ask me how I know :) Both shelves are completely full now and I've built a second unit for the next wave of cuttings. Three of your cuttings rooted despite the mold, all from the same batch out of the 3 batches.

If your plants are too tall for this another, possibly cheaper option would be to go with all clamp lamps and 100W 5000K CFLs amd have 1 on each side and slightly above each plant. So you have light-plant-light-plant-light-plant-light. Or as a grid