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using 2 will yield better coverage,, one unless high enough wont. it took about 3' of height for me to get a single 250 to cover , i had awesome growth and pure purple rocks in 4 months. i also just broke down a single 150 over my 40 with tons of sps. it was more than fine just the coverage wasnt great but worked out awesome that my lps loved the shaded areas and the sps loved the center. it really depends on what your keeping. i now have a 4x39 with reflectors that will grow just about any sps and clams. for half the heat.
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