HID Lighting (metal halide / high pressure sodium) has been the primary light source for outdoor applications until recently. LED is now the go-to choice for new construction, so what do you do with your existing HID outdoor light fixtures? The answer is to retrofit them to LED or replace them with a new LED fixture. As with all lighting projects, each situation is unique so it's important to understand what your goals are.
If your fixtures are in decent shape and your main goal is to save energy and reduce maintenance costs, then a retrofit is probably your best bet. If your fixtures are in rough shape and/or not providing you with adequate lighting, then a new fixtures is best. Here is an overview of things to consider for each option.
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