On 11/11/2010 12:42 PM, Arfa Daily wrote:When low pressure sodiums were
first
introduced for street lighting, as I recall, fog penetration - which
*is* inescapably good for yellow light - was one of the cited advantages
for the technology. Certainly where you find white (mercury vapour ? egg
shaped bulbs) high intensity street lighting in use, it performs nothing
like as well in fog.

Additionally, it was touted as "shadow free" which was supposed to help
the police "find the bad guys" in higher crime areas.

Jeff