Now you got 250w them plants will thank you for it. It shouldn't get too warm but they will put out some heat. As long as you got that fan blowing the air between the lamps and the tops of the plants you should be fine. And side by side like that is perfect. As for reflectors use what you got they shot the light down and thats what you want especially in a tent or a closet. Does it get warm on top of those reflectors? it all looks good.
If you stick with growing and expand you will probably get a air cooled hood or cooltube and some hids. I like hoods as they shot all the light down, a cooltube you can use for vertical grows(just take the reflector out and stick it in the center of the tent and circle the plants around it).