Sorry harmonic....

mirrors of any and all sorts simply do not work well for diffusing light.

As for the convex, that would work great if your were the Hubble Telescope. But not for weed.

Even some of the popular parabolic reflectors being sold with light kits are trash.

Go to Wal Mart and buy some of that thick white poster board.

It will work wonders in place of mirrors.

HAPPY POSTER BOARD SHOPPING