about lighting

ok so i set up a small veg room next to a flower room. between them all i put was 2 thin black sheets and there is about a 4 foot space. but i relised you can see that the light is on through the sheets. So is this not enough? or is it blocking enough light? Also some small pokes got in the tinfoil now the sun gets through little spots, will that matter?

ideally you want both sides to be light tight. the rule of thumb is no more light at "night" than would be given off by a full moon but i try for complete darkness.