hardening off

Hi all, I've been growing 8 varieties under a 300 watt mix of led and t5 flourescent lights indoors. My generous friend who lent me garden space hasn't finished filling in the back half of my garden space with top soil so I can't plant the tobacco till Sunday. I've been working on hardening off...

im just curious if anyone has experimented with this idea. as im sure weve all done before, if you leave a 5 gallon bucket or kiddie pool upsidedown on the lawn for a few days the grass under it seems to thrive. it loses a little green, but sprouts up like crazy. i was just wondering if it...