That is moderately expensive, so it is probably cheaper to get efficient ones. Even with the low-end LEDs, you are right, there isn't a point of going with T5HO anymore.
Within LED fixtures, there are huge diferences in the efficiency. With high-end (efficiency of 2-2.5 micromol/J), you are probably ok with 8-11 W per square foot. Since you are planning long day hours (15h), you might be ok with lower wattage than that (I use 12-13h). But with the cheap ones (the efficiency is about 1/2 compared to the best ones: 1-1.2 micormol/J), you might need twice the wattage. So you can calculate the total cost of ownership (initial cost + electricity cost) for a given time (say 3 years) in the same way you compared LED vs T5HO.
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