I say the bulb temp is about at least 600f at the very center or hotter. and on the second question the order should be length, width, hieght but you also didnt state wether it is in feet or meters or miles :-). if its feet then I would figure out how to grow your plants sideways because 1 foot isnt much. and if you use one of those fans that they use to create fake wind in movies I guarantee it will remove the heat.
ok wheres my cookie?