Re: Connect everything!
There is also, depending on the installation, electricity billing implications.
In certain cases, the electricity company bills the relevant local for street lights according to a formula that has a daily hours in use as one of the inputs. So, controlling the lights centrally makes it easy.
Don't think they bill street lights by actual consumption at the lamp post. So, a lamp may have failed, but it will still be in the charge. May be one day...