A struggling amusement park in Hong Kong is to launch a light show costing more than HK$100 million as it bids to boost business following a tourism downturn caused by months of unrest.Ocean Park’s operations and entertainment executive director Timothy Ng Sau-kin said on Thursday that the new night time tourism experience Gala of Lights was a nine-figure investment.It was part-funded by a HK$310 million government fund and will launch on Friday.Ng said he hoped the project would attract…