Its not just the light color. That is part of the equation.

Light below or underneath the canopy when delivered with floros will help prevent leaf death and undergrowth. As far as growing or vegging, you wont be able to grow anything but small tiny leaves and small tiny buds.

So floros NOT CLOSE to the plant surface will help PREVENT deleafage...but its benefits are pretty much relegated to that during flowering.

If you cant get the floros within 2 inches of the surface, it simply prolongs life that exists, but will help new growth but not enuff to grow balzin plants.

If you are in veg, and have the right lights within inches of the plant top or crown, you dont need side light...yet....