Ran across this simple PVC "greenhouse" and thought with a few mods it might work for an easy flip-down light deprivation system as well.
(feel free to move or delete if this isn't in the right place)
plans and materials:
(feel free to move or delete if this isn't in the right place)
plans and materials:
How to Build a Collapsible Greenhouse | Bonnie Plants
This DIY collapsible greenhouse made of PVC pipe and plastic folds down to protect plants during cold snaps, then can be raised up on warmer days.
bonnieplants.com