For comparison I have an 8-bulb T5 Tek-light over a 120, same depth and length but less width of a tank making the 8 bulbs roughly comparable to your 6 bulbs. The Powermodule is said to put out more PAR than the Tek-light. I can grow easy SPS (montis) on the bottom of my tank and haven't tried harder sps. So I would say you could probably grow SPS with your system but probably not as well as an 8-bulb Powermodule or metal halides.
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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