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<p class="MsoNormal">As I understand it, low pressure sodium vapor streetlights are used in the San Diego area as an accommodation to the nearby Mt. Palomar observatory. The resulting light pollution is relatively easy for the observatory to filter away.
If other light sources were used, the resulting light pollution would render the 200” telescope almost useless as a research tool.
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<p class="MsoNormal">Duncan Mahoney<o:p></o:p></p>
<p class="MsoNormal">Director of Technical Direction<o:p></o:p></p>
<p class="MsoNormal">Associate Professor of Theatre Practice<o:p></o:p></p>
<p class="MsoNormal">University of Southern California School of Dramatic Arts<o:p></o:p></p>
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