Well there are 3 main factors to determine transparancy and isolation of glass. There is a "U-value" a "G-value" and the light transmittance.
The first one is used for heat transmission. It gives the watts per minute per m2 that passes trough the glass. The lower the more the glass isolates...
It says so on the bottle :p
And now serious i think it will (without a brand name its only you who can really know, read some reviews maybe?)
The bacillus subtilis is a rhizobacterium. This is a bacterium wich stimulates growth of plant and roots.
If you are doing SCROG i would defoliate anything growing below the scrognet because not much light will reach that parts. Since you are allready in week 2 i would do it sooner than later.