24" 150w with 4 T5's enough?

It can be done but will depend on the bulb you use. Par is not a function of wattage, a properly setup 150 watt can and does best a poorly setup 250 or 400 watt. Use a 10K bulb and use the T5's to supplement and you will be fine. There are many many examples of 150's growing SPS nicely on the sandbed of tall tanks.
 
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