Dont forget the calculations are for coverage and not lumens you cant add lumens unless its a stronger bulb.. no worries im stoned ya know!
I was just figuring that I have more than enough light for the space being used and this is my second CFL grow..sig is first...
Sorry for the shitty math the first was in my head the second on ms calculator LOL!
And no it doesnt raise the lumens but it reduces the amount of light being lost by reflecting it back toward the plant... I have my flouro vertical so that i can disperse the light from the bottom to the middle and use the cfl for top coverage at the cola or main branch offs.... You can see the flouro in my pics ill make another one