A blog in The Times of Israel makes it clear that the normal time of lighting (“as soon as possible after nightfall”) is observed in Melbourne Australia:
For starters, it only gets dark well after 9pm. There’s no rush to get
home in time to light at dusk, and dinner is all over by candle
lighting time. Indeed, we have to keep the smaller children up for
candle lighting, after which we do our best to get them to bed!
Add to this a multitude of outdoor Chanukah celebrations in shuls and
local parks, typically culminating in a menorah lighting at dusk.
A Chabad article also for Melbourne starts:
Since the sun sets late in summer and the menorah should be lit around
nightfall, the younger children’s lighting often winds up being the
culmination of an evening of celebration.
But then the position is shaded slightly:
“We have a menorah parade in central Hobart and a public
menorah-lighting outside the historic Launceston Synagogue,” says
Rabbi Yochanan Gordon, who co-directs Chabad of Tasmania in Australia
with his wife, Rochel, “but we do it all when it’s still daytime.”
Gordon says the Talmud teaches that the proper time for lighting a
menorah is from dusk—sometimes not until 9 p.m. there–until the last
few stragglers are leaving the public market, in this case, the city
“Since our public menorah is electric, it does not qualify for the
mitzvah in any case, but if we were to wait for the proper time,” he
reasons, “there would be very few stragglers indeed.”
That means that the proper time remains around nightfall but Chabad there have public celebrations which do not technically constitute lighting the menorah.