The thing about using the best design here is not only does it reduce light pollution, but it also saves energy. You get the same ground level illumination from a significantly smaller bulb with the reflective down-facing fixture.
Reposted from fema 🚲
Going down a rabbit hole now but this is a very simple graphic I found that shows a small change in design can have a big impact here.

It seems obvious, and it is, but I see a lot of bad streetlights in the wild.

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