ROFLMAO, okay fair enough buddy.
Well if thats your room, and using your tape measure, your light is about 6 meters too far away!
Honestly, get your light closer, or the stretching that you are experiencing, will only get worse. Your plants, and I'm sorry to say this, but, they are horribly stretched. I understand that they are young, so that light, right now should be about 16" away from your babies. When they get older, a 400 watt light should be about 12" away.
I wouldn't switch to a 600, I would add a 600 though.
Using both lights at the same time.
Good luck to you buddy!
Peace