these guys got you covered pretty well. I have never experienced any issues with light leaks. During my first grow with autos. I was constantly opening my tent with the lights on to check the plants and take pictures. i was pretty excited. I had 4 autos then. If I have all autos in a tent. I will still go work in the room with the lights on and open the tent up to check in on the girls. I would never do that with a photo.
These are the plants from my first real grow. My first turned out to be all males