i made one with
this time clock
59-581-1015 is what you want (mfg # TA-4079) ...
what you want to look for on them is the SPDT That stands for Single Pole Double Throw
one load is off while the other is on
i was going to use the one i made for when i get another 600w hps ... two rooms, one is off while the other is on so there is just one constant 600w load
T_C