The bulb will set your hand on fire if you touch it
. Its fucking hot, like hundreds of degrees hot. In such a low grow box like yours you might want to Tip, Supercrop and train them around the room. If you can't have height, you may as well have length. As soon as they develop 5-6 nodes you should start training them over at a 90º angle. You will get a lot more bud that way than if you just let them grow straight up. An oscillating fan will do for now.