Most of the time it’s easy to see when technology is improving: new smartphones roll off the shelves every few months. But for other technologies, change can be harder to recognize—especially if you’re used to your current set up.

According to the Department of Energy’s (DOE) Commercial Buildings Energy Consumption Survey, which is the most current data available, more than 2 million facilities built between 1980 and 2003 have been using the same lighting systems for the past few decades- despite the number of advances in lighting technology made since then. Three quarters of commercial buildings have outdated technology.

Do you know if yours does?

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