I think the light would be perfect on the 30g for softies / LPS, but it's on the lower end of the range for SPS.
Using MH/T5 you would want 6 watts per gallon or more for SPS. LED's are more efficient so you can use a rough equivalency factor of 2x LEDwatts = MH/T5watts. This is a rough number, as LED efficiency can vary drastically depending on what LED's, drivers, optics, etc are used.
So using this formula, you are looking at 54w * 2 = 108w / 30g = 3.6wpg. That means this fixture is roughly equivalent to JBJ's 105w PC hood for the NC28. I grew SPS using that PC light, but it's not the best or fastest way to do it and you are limited to lower-light SPS.
For the price, you may want to look into dual-Kessils, AI SOL, or other fixtures. There are tons of LED's out there. The Maxspect and Radion are quite a bit more expensive, but are also more feature packed.