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The country can do it too. >> that's a lot of potential there. >> tons of potential. and really i think one of the things that we like to do is in chicago is we like to experiment and pilot things and then figure out how does that become a systemic change. >> reporter: los angeles has installed about half of the amount of lights as chicago, and some smaller cities like tucson have already made the switch. other cities like philadelphia, boston and pittsburgh are currently developing their streetlight modernization plans. with chicago now signing in a new light, the energy cost of industry ligh...

City expects the project to pay for itself. >> i think what we've shown for a city of this size, that we can pull it off. and that means cities all over the country can do it too. >> that's a lot of potential there. >> tons of potential. and really i think one of the things that we like to do is in chicago is we like to experiment and pilot things and then figure out how does that become a systemic change. >> reporter: los angeles has installed about half of the amount of lights as chicago, and some smaller cities like tucson have already made the switch. other cities like philadelphia, boston...