On a more serrious note BobBong...

I see the sheet metal whatever you call it covering the base of the plant...

This is not good. A GREAT idea, but not good.

#1. It is going to encourage mold growth on the soil surface. Mold prefers darkness almost all the time and I am afraid your contraption might just create the perfect environment....no light...no wind....no circulation....low oxygen...

#2. You will only reflect light that hits the sheet metal. All the other light will continue to be trapped....lost....eaten.....

#3. Once flowering kicks in good, you;re gonna lose all the bottom leaves anyhow. You need to get light UP into the density of the grow and I dont think reflecting around the base of the soil is enuff.

Make the whole bottom of the grow base reflective.

Ingenious indeed, but, for $2.00, Home Depot sells those styrofoam sheets that are easily cut to fit any situaton.

I know you and I don't get along....

But, I speak for the sake of your plants....

Here, on day 24, notice how the base of the grow chamber is all white and the light bounces off of every square inch of floor bottom......