how wide of a light hood do I need ?

I will be using a secret Jardin tent that is about 48 inches wide.
I want to use two 600 watt lights as two 1000w is just too hot and its hard to control temps where I am. My question is not how much light but how wide of a hood do I need ?
my two options are
24 inches wide or 15 inches wide
I would not normally question this and go with the bigger ones but I have concerns about the weight factor.
If I go with the 2 larger hoods it almost takes up almost all the weight limit and I have fans ect. to hang still
Ideas ?
 
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