Purchased this 48 watt LED light from Amazon. Arrived in a few days. Just mounted the LED light on a pole 21 ft high. Light sets at a slight angle as we used a mounting fixture from Lowes. Provides great light over a 150 ft circle covers the entire back yard with a great light distribution. The 48 watt light also lights a shed enough to see any activity from the house. The shed is 100 ft outside the main 150 ft (dia.) circle. The shed is about 200 ft from the back door.
The following site helps explain why LED lights are more effective than Sodium Vapor.
http://www.al-e.com/led-vs-sodium-lamps
These sites were also helpful
http://www.asdi.com/getmedia/05be9959-ebac-4251-a1ce-1537b5e7b743/SPECTRAL-SIGNATURES-OF-NIGHTTIME-LIGHTS.pdf.aspx
and
http://science-edu.larc.nasa.gov/EDDOCS/Wavelengths_for_Colors.html
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