Written Reply to Parliamentary Question on Colour Temperature of Singapore's Street Lighting and Feasibility of Warmer White Lighting for Street Lamps on Minor Roads

Mr Leon Perera asked the Minister for Transport

a.     what is the colour temperature of Singapore's street lighting;

b.     whether studies have been conducted to determine the feasibility of warmer white lighting for street lamps on minor roads, in view of the potential benefits in terms of human health and light pollution; and

c.     if so, what are the findings of these studies.

Reply by Minister for Transport S Iswaran:

1.     Today, most of our streetlights are LED lights, comprising a mix of warmer white light of 3000 Kelvin (K) colour temperature, and brighter white light of 4000 K colour temperature. LTA's research and studies of international safety standards has shown that both these lights have no adverse impact on human health as the blue light emitted is of very low intensity.

2.     The specific type of lighting deployed will depend on the distance of the streetlight from residential areas. For minor roads, especially those in low rise residential estates, LTA will generally deploy warm white light of 3000 K colour temperature.