it says to use secondary sources primarily not exclusively besides it being a rather obvious observable fact that the new street lights are brighter we have a reference in that they were claimed to be 'safer' i e provide more light the fact that light pollution is increased with increased brightness is non arguable it'd be like saying you have to prove the sun is generally brighter at mid day light pollution has to do with the amount of light used newer street light technology produces more light with less energy the less energy part is great it's the more light that has to do with light pollution how's this in the city announced plans to upgrade of its street lighting to new energy efficient street lights which use induction technology a modified form of fluorescent lamp that produces a broader spectrum than sodium vapor lamps the new system is predicted to save million per year in energy and maintenance costs and was proposed to make our neighborhoods safer by producing more light something that also increases light pollution while lowering visual comfort probability wikipedia retrieved february in san diego announced plans to become the first u s city to install cyber controlled street lighting using an intelligent lighting system to control led street lights side note i found several non local references while searching for 'street lights controversy' one claimed a battle was 'raging' in communities across the nation in places that were making the switch to brighter street lighting it seems to mostly involve people calling and complaining complaints in san diego held back further instillations along harbor drive and the pr person i talked to said he had dealt with tons of complaints and that was at an early stage of the upgrade there's also a battle in sacramento being waged to keep incandescent bulbs from being completely phased out i wouldn't be surprised if it's not widely covered by the media because they haven't come up with a non toxic energy saving bulb there actually was one being developed and now i can't find any information about it i know it to be controversial for many locals but i can't provide online references so i'm sticking to basic facts end side note