Cruise ships in the Hauraki Gulf are being told to dim the lights to help prevent seabirds being temporarily blinded.
The Department of Conservation (DoC) is working with the international cruise industry to help keep the birds safe.
The department's principal science adviser, Graeme Taylor, said the bright lights on ships can attract seabirds.
"They can be momentarily blinded, causing them to fly into a cruise ship and end up lying stunned on the deck."
DoC was working with the NZ Cruise Ship Association and Cruise Lines International Association (CLIA) to reduce the amount of light from cruise ships and advise crews on what to do when dazzled birds land on their ships.