DISCOVERY Bay Golf Club will introduce night golf to Hongkong before the end of the year. At a cost of $12.5 million the club will install 120 floodlighting pylons on nine of their 27 holes perched high up on the hills of Lantau Island. According to Bertie To Jnr, the club's executive director, the floodlit course will be open for play by the end of November - four months after the club's 10th anniversary celebrations. He said: ''We will be the first club in Hongkong to have night golf. We believe it is an added asset which will further enhance our reputation as one of the region's most progressive golf clubs.'' To said the lights, which were being shipped in from Europe, would be more powerful and effective than those used at many other clubs in the region. Although golfers would be charged a ''minimal lighting fee'', To was in no doubt that night golf would prove an overwhelming success. He said: ''The popularity of golf is continuing to increase and we're convinced that night golf will be extremely popular. ''More and more rounds of golf are being played at golf courses in Hongkong every month and the installation of floodlights will mean we will be able to utilise our facilities for a greater number of hours.'' To said during the winter months the lights would be switched on at 6 pm while during the summer they would go on at 7 pm. He said they would remain on until 11 pm throughout the year. ''It means people will have the option to play a round after work. I'm sure people in Hongkong will want to take advantage of that,'' he said. In order to cause minimum damage to the courses and keep maintenance to a minimum, it has been decided to split the floodlit nine among the club's three separate nine-hole layouts. The ''night nine'' will begin at the par-four first hole of the Diamond Nine - the original starting hole. The downhill ninth of the Diamond will be played as the second followed by the first and ninth holes on the Jade Nine, the 10th and 11th holes of the Robert Trent Jones Jnr-designed layout. Golfers will then move on to the Ruby Nine where they will play the first five holes, finishing with the downhill, dog-leg left, par-four fifth which is adjacent to the driving range. Floodlights will also be erected at the par-five ninth hole of the Ruby layout which is used as the finishing hole for tournaments at Discovery Bay.