You posted under Intermatic 240Volt T-1906 box-type timer:
Look at model number on inside of timer door.
If this is not your timer, then link below doesn't apply.
Wiring diagram appears on following link:
http://waterheatertimer.org/How-to-wire-T1906-Intermatic-timer.htmlIt seems unlikely you have expensive 240Volt box timer for aquarium light.
So add a comment with clear description of your timer/switch.
If you have wall switch instead of timer, please describe the device, and screw colors on device, and wire colors inside box.
Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on your do-it-yourself project.
Fixya is always less expensive than a service call.
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