Philips 321521 90-watt T15 SOX90 Low Pressure Sodium HID Light Bulb - High Intensity Discharge Bulbs - Amazon.com
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Sylvania 69519 - SOX180 Low Pressure Sodium Light Bulb - Walmart.com
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The Low Pressure Sodium Lamp
Shining a light on low-pressure sodium lamps in DESTINY | NGV
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Sodium-vapor lamp - Wikipedia
Lighting Comparison: LED vs High Pressure Sodium/Low Pressure Sodium
Philips 327817 35-watt T15 SOX35 Low Pressure Sodium HID Light Bulb - High Intensity Discharge Bulbs - Amazon.com
Low Pressure Sodium Lighting - Flagstaff Dark Skies Coalition
