Spacings are generally considerably larger in America, and they don't use lighting as much in general. However, they have no concept of lamp wattage to mounting height ratios, so an 8m column may be fitted with as little as 70w SON or as much as 1000w SON. Where I visited they used 100w SON at 8m in residential areas and 250w SON at 8m in more important streets.
American standards are very third world, and that doesn't just apply to lighting. I have been electrocuted on many occasions over there with their power sockets. Sometimes gravity is enough to make power plugs fall out of the wall sockets, and the only safety feature their power plugs and sockets have is having plastic casings. If the prongs are slightly in the socket they go live and it is very easy to touch the live prongs. Electrical wiring is nowhere near as regulated as in Europe either. Lots of wiring that dates from the 1960s in buildings of that vintage that just doesn't get replaced until it fails, power cut or fire, whatever it brings it seems. And then there was the restaurant I went to with sagging yellow ceiling tiles, slashed seat cushions and yellowed wallpaper peeling off the wall severely. Health and safety eat your heart out.Look like i won't be going to the US for the next 300 years then.
Someone who i know has installed BS standard plugs in their house in Hungary so that they won't have this problem of near electrocution or worse still, death.