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Published at Sunday, June 24th, 2018 - 10:30:41 AM. Lamp. By Darcia Gabrielle.

When you total up all of the costs together, the numbers are staggering. In a groundbreaking study by Florida Atlantic University's physics department, researchers discovered that when you combine all residential, commercial, and municipal external lighting together, the U.S. spends about $11.6 billion annually. Of that figure, approximately 30% is what they call "wasted lighting" ($3,487,306,003)!

But there is a growing movement across the country to reduce these unnecessary charges as much as possible. The trend first started when budget-strapped cities began outfitting highway signs and street lights with solar photovoltaic (PV) technology. Rather than rely exclusively on the utility grid, these local governments realized they could illuminate their communities using clean and free sunshine. And far from being an expensive upgrade, replacing grid-tied lamps with solar powered alternatives turned out to be an affordable investment that quickly paid for itself. In the past 5 years, solar costs have come down even more, bringing the technology within easy reach of everyone. Better still, the payback periods are even shorter.