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For 150W HPS what does the suffix "LX" or "CE" do?

When 150W HPS fixtures are ordered they require either an "LX' suffix or "CE" suffix.  "LX" indicates the fixture will be used with a 55 volt Lucalox lamp.  "CE" indicates the fixtures will be used with a 100 volt Ceramalux lamp.  The indicators require a special ballast be used based on the lamp preferred.  This only applies to 150 watt HPS lamps.  The "LX" option is the most popular.