Quick Fluorescant Question

I am currently vegging in a large trunk 20" x 20" x 33". With two 300 watt cfls (pics uploaded) I plan on using it just for clones, upgrading my light to a 2ft tube fluorescant. My question being should i go with a two or four tube light?
 
with fluoros bigger is almost always better. if you can control heat, fit it in without sacrificing needed space, then put it in there.
 
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