looking for a good 4x4

In the market for a 4x4 tent. Lightproof is a big issue for me and I've read many reviews for different tents but was hoping some people from the community could help me find a good tent. I've noticed many tents advertised being lightproof but the lower ventilation flaps that's usually advertised for air flow seem to defeat that purpose since when they are opened light get's in/out. Am I missing something here? I could see if you ran some duct through a lower port and keep the flaps closed it's then lightproof.Would anyone have any suggestions for a 4x4? I don't need anything crazy like a Gorilla tent. Just something with a few vent ports and able to hold a light w hood/filter/fan.Ther one below looks like it would be great for me but I haven't come across any reviews and this is my first tent.http://www.accesshydroponic.com/48x48x78-inch-mylar-reflective-aluminum-frame-grow-tent-room.html#.Uk3uAYasiG4An Agromax from HTG also looks good but I've read many posts of people where the tent Gasses off.http://www.htgsupply.com/Product-Grow-Tent---Medium-(47x47x79)-Silver-Lined

I got a "grow den" brand 4x4 tent off ebay for $115 u.s. and its great for a beginner. I have it in my garage where it stays dark during the day( lights off) It has velcro flaps over the screens on the bottom and the duct holes have close-able sleeves. I sat in there and did notice some light leakes around the zipper. but pushing the door or window to the inside of the tent when zipping closed causes the fabric around the zipper to overlap in a way that seals it up good enough for me. No problems....yet. and my girls are loving it.