I'm going to be laying down a floating engineered wood floor on a concrete slab next week. I'm installing in the livingroom/kitchen area and a hallway. The hallway is at a T from the rest. I read that it was best to install the flooring parallel to the light source (which makes sense). Naturally, I think the planks should also run the length of the hallway and not the width. How can I do this without having to use T molding?

You mean a T at the beginning of the hallway? Why would you need one there? If is length of the floor and the T requirements of the manufacture just undercut your door casings very deep and leave twice the expansion, and a little more around the perimeter of the room.

Because of my inexperience with floors, I either didn't state what I want to do right, or I just don't understand the response. I've attached a picture that is a crude diagram of what I want to do. I just want to know if I can butt the long end of the planks from the main room up against the short end of the planks in the hallway without having to use some sort of T molding. Obviously some precision measurement and cuts are involved, but that's to be expected for pretty much the whole project.

Thanks again for your help.

I'd run the whole job the same direction. If you mean lock together the short ends onto the long side of the plank, sure you can but you would need to have a random plank laminate or your end joints would all be the same. Did I understand that right this time?

Floorme is right the only way to do that is if you have at least three length planks in your floating floor. If you do what Floorme is trying to say is run the planks long way in the hallway and the other direction in the other room. You just have to leave an uncut plank in the room where it meets the hallway that way you have your locking system to tie into.