Typically I do my best to give my plants some chance to harden off by reducing the low-end temperature of the grow box and bumping up the extended time the internal fan runs as well as letting them have a few hours out in real sun when schedule and weather permits.
Fortunately/Unfortunately eventually these plants have to venture out on their own. To provide some protection to these plants for the first few days (or extended periods of very hot weather) it is best to provide screen to allow the plants to acclimate to actual sunlight. Of course you can buy some netting screen but having a pretty small yard and even smaller garage this is something I do not want to pay for nor have to fold back up and search for again until it is needed again.
My solution is to “borrow” the window screens from a couple windows I pretty much never open (behind my desk I am typing at now) this provides a good screen with a sturdy frame which as you can see I have simple rested against a fence…though if you did not have a similar structure you easily could use a couple bamboo poles or stakes to hold the screen up.
Great part after a few days or week you simply snap them back into your window where you will easily be able to find them next year…