electrician help

what kind of relay out there could switch supply from ballast to 2 sockets on a 12 hr cycle thus running 2 12/12 cycles from one continuously running ballast

what ballast would have dual timers or are you switchiing manualy

no i wanna switch with a relay shouldnt be hard your just swapping the load on the black,just wondering if someone could point me in the right direction

This kind of thing ? http://www.homehydro.co.uk/index.php/lighting/contactors/powerstar-contactor.html

But you want to flip flop from one block to the other ?

I think that unit has one timer powering both blocks at the same time ... But is that the kind of thing you are looking for ? ( But with say ... 2 timers ? )