I think i have this figured out, I am going to use two motors, two times, and two momentary pushbutton switches.
I will set up the timers to come on when I need the lights moved as the lights travel down they will hit the switch and stop the motor. Very basic and simple since i couldn't find the timers i could program to half seconds this will kill power to the motor once it reaches it's position.
I've had to think about this abbit and this is my idea patent pending water weights each side of tank simple dosing pump and timer .It would be as easy as transfer water to which either side you wanted lights to go to
just a thought
Have you tried hydroponic suppliers? A lot of indoor growers use them and I saw a lot of them while reading threads.Working on and idea for a trolley system to move my lights from one side of the tank to another, I can make the trolley system but the problem I am having is how to control the motor to pull them down to the other end and have it stop exactly where I need it.
The idea is to run dual 400w halides over one end of the tank for 6 hours then have it trolley to the other end and run for 6 hours then turn off and reset at the beginning.
My thinking is with the 400w halides over one section my corals will get the light they need in 6 hours then I can bring them down over another section for 6 hours saving me on bulbs, equipment costs, and power consumption. If my thinking is correct the corals will still get the photo period they need.
Let me know what you think of the 6 hour photo period and any ideas how to control the setup.
Thanks
Eric