Ms Gibbons said the lamps would be retro-fitted with reflectors to project the light.
It is all being done in readiness for the 136th anniversary of the first opening on September 7.
The Watt Fountain is a memorial to Whanganui's first mayor, William Hogg Watt, who owned Lake Westmere before gifting it to the town as a water supply in the 1870s.
In 1881, the Whanganui Chronicle reported that the opening of the fountain brought the townspeople out in "great force".
The fountain, described as an "elaborated gothie" was designed by Whanganui architects Ross and Wright and made of cement, cast iron and marble.
The article described the four gables of the fountain as being "decorated with incaustic tiles" and reported that "the water plays from a gilded lion's head into a trough".
It even had a drinking vessel attached to a chain for "the wearied traveller to quench his thirst".
The fountain was moved to Cooks Gardens in 1906 to make way for tram lines then spent several years in storage before being moved to Queens Park in the 1930s.
A new base was installed when the fountain was returned to its original site in 1993.