LED signage and lighting needn't be all bad. The entire area bounded by the Ship Canal, Lake Washington, 65th St, and Puget Sound has now been converted to LED streetlights.
You'll notice the natural character of the light, as compared to the terrible spectrum coming out of high pressure sodium lighting still in use elsewhere.
It's challenging to make straightforward comparisons between LED and HPS lighting. The most thorough study of the topic seems to have been undertaken by the ... er ... urban cultivation community.
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