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The problem with LEDs is the massive increase in light pollution they cause.

But do they? LEDs are directional vs Sodium is omnidirectional and reflected; So given a similar housing, LEDs causes less light pollution.

The bigger factor (in my neighborhood at least) is the LEDs being many times brighter than what they replaced.

All light is reflected, unless your neighborhood has opted for an avante garde Vantablack theme.

Given a similar housing, the brighter light causes more light pollution.