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Ben Krasnow on Twitter: "You can still buy low pressure sodium lamps (eg on Amazon), but the ballasts are expensive and rare. I found that using a cheap CFL ballast, and replacing
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Amazon.com : Advance 71A0590500D - 90 Watt - Low Pressure Sodium Ballast - ANSI L72 - 4 Tap - Power Factor 90% - Max. Temp. Rating 221 Deg. F - Includes Dry
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