Forget having to adjust timer to keep your 12 volt lights coming on at dark.This transformer has a photo eye that automatically turns on at dusk and a timer that runs for four, six or eight hours before turning the lights off. Transformers are epoxy filled and weatherproof for long life and have field replaceable fuse in case of overloading.
Available in 100 or 150 watt sizes. UL listed. (Six per case)
Spare Me! Keep a spare air pump or water pump on hand for emergencies. If your pump ever stops, do not feed your Koi.
Consider using seperate water pumps for your waterfall and filter. This way you will always have a backup, and you can save energy.