I just had an idea digital! You could use Mylar, cut into 4 large triangles, and string it from just above the light, to black folder clips on each "tree"... Basically make a Mylar pyramid. IDK, I'm just rambling.
I think that is the only way, to use a light meter as you said... What did yours read? Also how did seed potting go?
I think that is the only way, to use a light meter as you said... What did yours read? Also how did seed potting go?