It didn't make sense to me but it's a repeatable experiment so I've had to learn from that.
Much the same with venting cold air in from the bottom. In there it just gave me 2 temp zones. A cool one at the bottom and grill at the top.
The latest big find is in using 6500K light in a 12/12. Granita is the first to benefit from it. All previous grows lost the shade leaves very early in the flowering stage. So much so that I needed to do very little manicuring, but those leaves are bud food so I wanted them to stay on!
10% 6500K and I have lost virtually no leaves.
I would guess that this also works the other way and that a 2700K in veg will help plants to switch to flowering faster, but it isn't an experiment I'll be trying soon as I don't do veg.
Here's a pic from during the heatwave that shows the inside of the case. With the new pots I actually have a bit of free space on the left now and I can't help thinking I can use this for a bonsai mom. I wish I could leave well alone
Here's your pic: