New bulbs could save millions
Energy-saving bulbs are being tried out in traffic lights - a measure which, if extended city-wide, could save $6.7 million a year in power bills.
The bulbs have a 10-year lifespan and use only a third of the power of existing bulbs, which only last up to 18 months. The Transport Department's traffic-light power bill is now $10 million a year.
The new light-emitting-diode bulbs are twice as expensive as normal bulbs and cost more to maintain. The department has installed the bulbs in lights at 10 junctions and plans to install them at eight others.
The $1.5 million pilot scheme will end in September, when the department will decide whether to install them at all the city's 65,000 traffic lights.