Nothing will save you more than a light that’s off. Your ROI will depend on the size and complexity of the project. Another big component to your project’s ROI is whether or not your local utility has an incentive program in place to encourage the installation of conservation devices, like motion or light sensors. Check http://www.dsireusa.org/ to see if there are any programs in your area. There may be other programs out there that are not on this site. You’ll need to contact your local utility to know for sure.
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