if i need a second one ill get one but i think one should be good, im mean i guess i could get fancy n hook each light up to its own switch but i think ima just go 1 switch for all the halides, 1 for the actinics, 1 for the skimmer, 1 for the return, 1 for the phos reactor, 1 for closedloop or powerheads (which evr route i decide on) ect....