I recently read a thing about LEDs and light pollution... people (organisations...) have been replacing outdoor lighting with LEDs without accounting for the higher brightness... and as such, they have just been overlighting the area instead of intelligently replacing the lighting! So more light pollution and slightly less effective reduction in power (although, the sheer magnitude of the power efficiency is more than worthwhile!).
This actually makes sense and may have a negative effect on animals.
I've also noticed that car headlights are a lot more annoying and my eyes adjust to the warm glow fasters when driving between lighted areas of the road so there may be safety concerns, too. Fortunately the color spectrum and brightness area easy to adjust, never mind intelligent sensors and times, etc.
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