Trying to determine the best way to trigger a set of two safelights (or even one safelight for that matter) from two separate timers, both of which use a standard switched off circuit (safelight) during exposure. Connecting a single safelight to each timer is a piece of cake and obviously works independent of each other - but what I'm trying to accomplish is basically have 2 outputs drive switching for a single output, i.e. if any timer has prevented current to it's safelight circuit - then I want all safelights off - regardless of which timer did it. Both safelights would also use the same power strip/extension cord/etc.
Seeing as the typical 120vac output for a safelight circuit is usually switched by a relay within a timer itself - I don't see how I can realistically make use of the output as a control signal. Using a single N-O relay with 120v capacity on the input side connected to both safelight legs seems a bit crazy and asking for trouble - especially if both timers were by chance not using the same supply circuit. But maybe I'm not thinking it all through.
Remember that my desire is if any safelight leg is off, I want them all off (more than one enlarger+timer being used concurrently).
Another alternative would be to say screw it and leave the safelights on all the time.