LIGHT
POLLUTION at Southern Stars Observatory
Since
March 2007 , the City of FAAA has installed Street Light in the road in
the North :N.West of SSO , the pollution is caused by 5 standard lamps
and one is just in front of the observatory . the lamp are
Sodium high Pressure

Spectrum
Sperctrum Sodium Hight pressure Spectrum Sodium low pressure
Sodium low pressure is easier to filter than High Pressure Sodium