Hey CT.........I`ve gotta show major respect for a timer board like that with all the emt flextubing and expert workup on the junction boxes along with numbered receptacles.....IMO.......There`s no room for bad advice or cheaping out on electrical......Overkill will always save your ass....I`ve priced flip-flop relays for yrs. and I just can`t bring myself to drop the cash.......I run flip rooms and they`d benefit me greatly but I`m too damn tight to spend thousands of dollars on inflated equipment prices.....I`ve seen numerous threads on howta do relays but I`ve got Lumenace and all of the other different colored Lumatek ballasts......Without hands on knowledge about digitals since I`m too paranoid to involve anyone else in my grow much less risk fuckin up THOUSAND`S of dollars worth of equipment I`m still in the newbster mode.......That being said....... I`ve always used the Intermatic heavy duty digital outdoor timers Pharmacan posted earlier about w/battery backup and I`ve never had a failure in over 12 yrs. useage.......Mechanicals can`t restart and compensate for the time lost thus why digitals are superior if the right sized and wattage rated units are used.....Don`t get me wrong..........I replace mine every 10 runs or so for insurance cuz they`re cheap and they run 24/7 but as a rule they`ve been the shit since the battery backup keeps the cycle inline till power`s restored.........I run 3-600`s in each 6x6 room and they`ve all got their own 20 amp breaker and HB88RC timer set 5 minutes apart to keep power surge down when starting the lights .....6 different timers for 6 lights.......Yeah.....I`m a damn dinosaur but my shit functions and moves from spot to spot pretty easily although I`m always jealous of the pre-built controller boards ...........Ya`ll take care..........DHF........ ........