LCD IPS panels are a crapshoot. Sometimes you get lucky and get an awesome flawless one. Sometimes you have light bleed, yellow streaks and god knows what else. The more flexible the platform, the worse the problem tends to be. I owned an Acer R7 with an absolutely rigid platform and there was no light bleed all. I've owned the SP3 and the Yoga 2 Pro and both had light bleed, the Y2P being worse because of course, it is more flexible.
And that's the risk of returning your model unless the light bleed is so bad is intolerable. There is always the chance the replacement unit will be worse. Unfortunately, opening it in the store is hard because they don't generally let you open the box until you've bought it. Also store lighting is so bright you may not notice light bleed you would get at home.
This is one of the great pluses of the newer super amoled screens as on the Tab S - zero light bleed.