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Why are there two lamp options? When would I use a quartz halogen lamp over the mercury vapor lamps?
Turner Designs offers both a quartz halogen lamp and application specific mercury vapor lamps with the TD-700 in order to give customers ultimate flexibility in configuring the fluorometer for their specific needs.  The quartz halogen lamp irradiates the sample with a broad range of light, operating best at wavelengths above 400 nm.  This broad range of light allows the user to analyze many different analytes without a lamp change.  The less expensive mercury vapor lamps emit a narrow band of light. Turner Designs sells mercury vapor lamps for chlorophyll, rhodamine, and hydrocarbon measurement.  For multiple applications, the user could purchase several mercury vapor lamps but would need to switch lamps between analyses.