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Council group transport manager Jeanine Benson said contractors had fewer than 200 lights left to install, from a total of 13,700.
Work was on track to finish by the end of this month.
The total number had been refined as the project progressed.
"Some heritage lights in the central city haven’t been upgraded, and no decision has yet been made on what will happen with them.
"There are also some lights inside private development sites still to be replaced, and we’re working with developers on plans for those.
"Other remaining high-pressure sodium lights are in locations that are either hard to access, inside council car parks or at pedestrian crossings."
Work had proceeded with no major issues, she said.
"The replacement of lights close to high-voltage power lines has been a challenge, but our contractors have performed well."
The NZ Transport Agency was funding 85% of the project cost.