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  1. Apogee MU-200 UV Meter with Separate Sensor

    Apogee MU-200 UV Meter with Separate Sensor

    $395.00

    Apogee MU-200 UV Meter with Separate Sensor Learn More
  2. Apogee MQ-200 PAR Meter

    Apogee MQ-200 PAR Meter

    Regular Price: $349.00

    Special Price: $334.95

    Correcting for the Spectral Errors of Common Electric Lights

    Because of the increased popularity of the reefkeeping hobby, the reef tank lighting market has recently grown exponentially with hundreds of lighting options now available. Unfortunately, all types of electric lights have a unique spectrum, and therefore also yield a unique set of spectral errors when measured by any commercially available PAR meter. These errors are generally minimal and shouldn't be a concern for most aquarists. However, when high precision is required, the following information, and a little bit of math, can help.

    In response to emerging electric lighting technologies, Apogee has done extensive research to help customers make accurate PAR readings. Spectral errors for different commercially available lights were determined via the method proposed by Federer and Tanner (1966). These results are found in the table below.

    The spectral errors of common lights such as CWF, CF, MH, and HPS are fairly straight forward. To make a high precision PAR reading for these types of lights, simply recalculate the PAR reading given by the meter with the corresponding percent error from the table below to yield a more precise PAR measurement

    In recent years, LEDs have gained popularity in the marketplace due to their low power consumption and minimal heat output. This is great for cost savings, but due to the unique spectral output of the various colors (for example, very narrow wavelength ranges), LEDs present a challenge when attempting to make accurate PAR measurements. With commercially available PAR meters, certain colors of LED tend to read high, while others read low. The best device for accurate PAR measurement is a spectroradiometer, which provides intensity readings at each wavelength. However, these are often not well suited for underwater measurements and can range in price from several thousand to tens of thousands of dollars.

    When used properly, the MQ-200 offers a very reliable and economical solution for precisely measuring the PAR output of LEDs. To achieve the highest level of accuracy, simply recalculate the PAR reading given by the meter with the corresponding spectral error percentage from the table below.

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  3. Apogee SQ120 PAR Meter Cable

    Apogee SQ120 PAR Meter Cable

    $139.00

    Apogee 5 meter PAR Meter Cable. Learn More
  4. Apogee AC-100 Cable and PC Software

    Apogee AC-100 Cable and PC Software

    $69.30

    Apogee AC-100 Communiction Cable and Software: AC-100 Learn More
  5. Apogee Sensor Wand

    Apogee AM-320 Saltwater Submersible Sensor Wand

    $55.00

    Apogee AM-320 Saltwater Submersible Sensor Wand Learn More

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