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just read about a town switching streetlights to LEDs and saving thousands
Saw this article today about some small town that swapped out all their old streetlights for LED bulbs. Apparently they're saving like tens of thousands of dollars a year now on electricity bills. Pretty impressive, honestly. Made me wonder if more cities should be doing this. But then again, I don't know much about the upfront costs or if there are downsides. Curious what others think - is this as good as it sounds or am I missing something?
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The “tens of thousands a year” figure should include more than the electricity bill. A useful comparison would break the project into:
- energy savings at the actual tariff and operating hours
- reduced lamp and maintenance visits
- replacement fixtures, controls, and installation labor
- financing or lease costs
- disposal and any utility rebates
The payback can look very different depending on whether it’s a straightforward lamp replacement or a full fixture swap. If the existing housings can accept LED lamps, the upfront cost may be modest. Replacing every fixture, rewiring, adding dimming controls, or upgrading poles can push the payback out for years, even with substantial annual energy savings. Also, poorly chosen LEDs can create glare or excessive color temperature, so the lighting design matters alongside the accounting.
The maintenance savings can be overstated if “useful life” is treated as a guaranteed lifespan. LED ratings often describe the time until light output falls to a percentage of the original level, not the point at which the fixture stops working. Lumen depreciation, heat, moisture, and early driver failures can all shorten the practical service interval.
The comparison should also confirm that the replacement still provides the required roadway illumination. A cheaper, overly bright fixture can create glare and poor uniformity, while an underperforming one may require corrective work later. Energy savings are meaningful only if the LEDs deliver the needed light for their full projected life, not just on installation day.
Margaret mentioned dimming controls, and they can change the electricity estimate quite a bit. The comparison should use the watts drawn across the actual nightly dimming schedule, not assume the lights run at full output all night. Did the town’s savings figure account for that, or were the LEDs left at full brightness?