no matter if you take 500 or 700 series, the transfer rate is exact the same, max 100kBps.   100 bulbs on same time means on both, one by one turn on, get ack, turn next on , get ack ... (yes, one can do it faster with bc/mc/distributed zwave/ association proxy, but the result is exact same for both at the end of the day. Yes, there might be advantage of "faster" Cortex M4 core vs. 8051, but we talking about 100kBps, and 8051 in the zw500 can drive two uarts at 230k).    
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