what are the blue lights on street lights

The blue or purple lights on some street lights are not intended to appear that way. They are caused by a manufacturing defect or a coating that has worn off, causing the LED lights to emit a different color than intended. The LED lights were originally installed to replace sodium vapor lights from the 1970s, which were difficult to maintain and needed regular replacements. The color change is not permanent, and the faulty lights will be replaced with standard white lights across the state as they are under warranty. The purple hue is not harmful or unsafe and will not impact visibility. Customers can report streetlights displaying purple color by calling the respective utility company.