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'The Coalition's green light plan will begin the process of converting 330,000 1980s-era energy-intensive mercury vapour street lights to energy-efficient fluorescent lighting,...
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The 'age' article tells about canceling replacement of (presumably high-pressure) mercury vapor lamps by fluorescents. The latter are way more efficient (80-100lm/W) then the Hg-vapor ones (< 50 lm/W).
This is tempting for town councils to make a compromise: more light , less energy. A good idea as long the lamps are really shining onto the streets and not in neighboring gardens or, worse, upward.
The so called 'design' fixtures such as the transparent ball shaped ones which shine 360º around (and upward) or upward shining lamps with a reflector above it (but not all), do more worse than good.
