If you have a canopy to hide your top make a frame the size of your opening get a piece of fine fishnet and stretch over it. No light reduction, protection for jumpers and all the benefits of going topless like no tan lines and gas exchange.
*The fact that no one understands you doesn't make you an artist.
*If guns kill people...Spoons make Michael Moore fat.
I remember reading on this site that the egg crate can magnify the light, but it has to be turned the right way. I use them on my FW tank and it seems to let in a lot more light than the glass. Lots more evaporation though.