I have been there April, 2014 by taxi. Really we didnt found the light. Read, what I have found in Wikipedia:
Singapore's first automated, unmanned lighthouse, Bedok lighthouse stands at 76 metres above sea level. It began operating on 9 August 1978 and its 600,000 candle light beam was reported to be visible at sea for up to 42 km. It cost $225,000 and was a replacement for the Fullerton Lighthouse on top of Fullerton Building, which would be obscured by high-rise buildings in what is now the Marina Bay area.[2]
In 2014, a new lighthouse will be built atop the 25-storey high Block 3, Marine Terrace. This block was chosen to replace Bedok Lighthouse and will become operational by the third quarter of 2015. This will be the first lighthouse atop an HDB block.