exactly... this would be ideal for two flowering rooms on a 12/12 schedule, sharing a single ballast. if you understand relay logic at all, you can play with it to run as many ballasts as you want, using the NC contact on the 6042 altronix relay as an output controlling as many relays as you need ballasts.... you would also do the same thing for the lamp switching relay, just add another DPDT relay to the output circuit (Zone 2 output which is the purple and brown in the schematic, activates the DPDT relay)and wire the lamps as shown.
another reason i chose both the altronix relay and the lighting control panel for this design is that the parameters of both are very simply adjusted, and with a little experimenting you can really do some complex control operations using this simple equipment. its not quite a fully automated plc system like we all drool over, but it comes pretty close at a cheaper cost.
i would do a plc design, but it would be all but useless for the grower, as the software used to configure the damn things are proprietary and also require a good knowledge of computers to setup. and they are also rediculously expensive. i made this for someone that wants the 2-3k control setup but only has 1k to spend...
i am looking for a cheap(preferrably end user configurable) 8-12 channel I/O device to use as a logic gate... but having a hard time finding one. if i do, i can do a design for just about anything a grower could need, from co2, to ppm, the whole shebang.... just be prepared to spend some $ on equipment, my designs are based on function and reliability, so if i specify a part number, its for a reason, not because its something i found in a search engine. i will in most cases try to find a reasonably priced component for my designs, in this case i went with torx and altronix as i know there products pass the test, if i wanted to stick it to you , i could have spec'd the whole design for allen-bradley parts, lol, and it would add a cpl hundred to do the same thing