IT was lights, cameras, action at Sha Tin last night as the Jockey Club put on a full dress rehearsal for the first night meeting on the turf at the New Territories venue later this month. Three trials were run off under the newly installed floodlights with the videomatrix and closed circuit television keeping several hundred interested spectators up to date with the action. The show went off without a hitch but the brightness of the lights concerned some senior riders. Champion jockey Basil Marcus said: ''They are certainly not as bright as at Happy Valley but you could hardly expect them to be as it is such a big track. ''We did not have any visibility problems, you could certainly see where you were going.'' Australian ace Darren Gauci added: ''At Happy Valley the lights tend to be right above you and they are definitely brighter - or seem to be. Maybe it's the size.'' Director of Racing Philip Johnston was satisfied with the experiment and said: ''Safety wise, it was absolutely all right.'' The first trial went to the well-performed Nervous Witness who seems to be finally hitting his straps after a rather lacklustre season. He came sweetly clear inside the final 150 metres to win going away from Red Ruffian. Global King was responsible for a clear-cut win in the second event but the one to bear in mind is griffin Plentiful Harvest. He was ridden right along at Happy Valley at his first outing and knocked up to finish sixth, but he will be a lot closer the next time. The third trial went to Kowloon Might and Marcus who made all and was never seriously threatened. There were also three trials on the equitrack yesterday morning with, once again, defending champion trainer John Moore underlining that his stable is set for an end-of-season flourish. Moore's Australian import Amigo was one of the morning's most impressive performers. He has been working well since arriving in the territory. Yesterday he went from pillar to post under a very tight hold in the morning's first trial. Had he been let down there is little doubt he would have beaten Peter Ng Bik-kuen's Golden Luck. Geoff Lane and Declan Murphy have enjoyed a really good season together and the way the fragile-legged Golden Dragon is shaping they could have another winner in the near future. Golden Dragon was highly thought of when trained in New Zealand by the O'Sullivan brothers. Jockey Lance O'Sullivan once said he was surprised the horse had not made it into Class One! Work watchers had to rub their eyes and take a second look when Murphybounced Nickels King straight to the front and made all in the second trial. The accomplished Irish-American jockey is the master of the barrier trial masquerade, habitually finishing nearer last than first, leading to the conclusion that Nickels King cannot be the force he was otherwise why show him up? Or, in this game of equinepoker, was it a double bluff? The former seems the more likely explanation. Murphy also took the final trial on Let It Ride who has already won this season. The one to watch for the future was Bruce Hutchison's Fortune Basin who galloped all over the top of them but was kept under restraint by Darren Gauci. MORNING SESSION First trial: 1, GOLDEN LUCK (D. Lee); 2, Orchestra (C. H. Yip); 3, Speedy Winner (H. K. Yim). Others (in finishing order): Amigo, Super Hero, Golden Dragon, Music Magic, Shining Star, Highway Patrol. Time: 1.03.9 (24.4). Distances: 21/2l, 11/2l. Winner trained by Ng Bik-kuen. Second trial: 1, NICKELS KING (D. Murphy); 2, Cloud Seven (H. K. Yim); 3, Hidden Treasure (D. Lee). Others: Rising Sun, Captain Ron, Gladstonian, Chung San, Procion, Simply Great. Time: 1.02.7 (24.5). Distances: 5l, nk. Winner trained by Geoff Lane. Third trial: 1, LET IT RIDE (D. Murphy); 2, On The Double (B. Marcus); 3, Schnitzer (W. H. Tse). Others: Happy Money, Fortune Basin, Grand Occasion, Green Supreme, Eastern Saga, Success. Time: 1.02.7 (24.0). Distances: Nk, hd. Winner trained by Geoff Lane.