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Oh! the coral require Metal Arc lighting. LEDs and getting better but we are late to get really good ones with the right spectra.

Rube Goldberg Maybe? Yes The actual light “can” will rotate left and right on the carriage. My intent is to add a curved piece of plastic next to the track. I will have a cam follower rolling over it. That way, the can will start the day on the right side of the tank but point to the left...

Thanks That sounds like it’s on the right track. Are you in product support for FM?

I don’t want to follow the sun. I want to simulate the movement of the sun. I want to move the light across the fish tank so that it looks like the a sun light source that is moving.

Thank you. I will start researching telescope drive motors. Succinctly, what I am trying to do: I want to turn a motor on at a settable time of day and have a contact switch that can turn off the motor until the timer re-starts it again.

I am building a device that moves a light approximately 5 feet and then returns it to the starting point every 24 hours. I would use a standard clock timer switch form the hardware store to turn the light on for the out bound leg of the trip and off while it returns, to simulate the motion of...