Best shade of white to paint grow room

Get flat white paint and add extra titanium dioxide at the paint counter. They'll usually add an extra ounce of titanium dioxide per gallon at no extra charge at Depot or Lowes. Blows polywrap and regular flat white out of the water son.
 
Flat white paint, made for bathroom or kitchen applications. Has a mildew/mold inhibitor added. Or KILZ primer/sealer. Make sure new drywall or masonry is sealed and primed with the best sealer/primer available. Stay away fro Home Depot and other big box store paints. Very low in pigments. I owned a large painting company in Chicago for years. Know a bit about the subject.
 
I recommend you paint or spray with something that blocks mold and possibly insects, then hang (double sided tape or staples) mylar on walls. Paint floor flat white. Mylar is more reflective, and it reflects colors more true to source. If you use UVB mylar is the obvious choice since white doesn't reflect UV as UV, it's shifted to violet (black (uv) light effect on white.) Diamond vs Regular is more for the grower's ease of mind than the plants, bright spots move with the mylar fluttering in the wind, no negative effects...
 
Use a couple coats of kilz. Then go to Kelly Moore and get FLAT white paint. Couple coats of that and youre good to go.
 
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