So with an Art. 700 installation the lights can be dark for up to 10 seconds until the generator takes over. In an Art. 702 installation the lights will remain lit, on battery power, until the generator takes over. Is that correct? And the reason for this is because the exit/egress lights cannot rely on the performance of an optional stand-by system. It makes sense, I suppose, but at first glance it seems a little bass ackwards.