Spectrum Technologies Lightscout DLI 100 User Manual
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Spectrum Technologies Lightscout DLI 100 User Manual

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DLI 100 LIGHT METER
Catalog # 3405
User manual

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Summary of Contents for Spectrum Technologies Lightscout DLI 100

  • Page 1 DLI 100 LIGHT METER Catalog # 3405 User manual...

  • Page 2: Table Of Contents

    Replacing the Battery Warranty CE Declaration of Conformity Thank you for purchasing a LightScout DLI 100 Light Meter. Please read this manual thoroughly before using your instrument. The DLI 100 accurately measures the PAR light that falls on it over...

  • Page 3: Quick Start

    Quick Start Decide where you want to measure Page 4 The DLI 100 comes as a set of three units so you can compare the amount of light received in multiple places on the same day. Start measuring Pages Press the button on the shoulder of each DLI 100. The LEDs will light upward, and will blink every 4 seconds to show the current light intensity.

  • Page 4: Where To Measure

    Where to Measure? The DLI 100 comes as a set of three units so you can compare the amount of light received in multiple places, without the uncertainty caused by environmental differences across multiple days. Use a “Control” Use two of your DLI 100s to measure two locations of primary interest—on a greenhouse bench, or on a shaded green or tee box at a golf course.

  • Page 5: Using The Dli 100

    Using the DLI 100 Place the DLI 100 in the ground at the desired location for evaluat- ing the amount of available sunlight. In a greenhouse insert the me- ter into a container of similar size (containing substrate only) to that of the crop being grown.

  • Page 6: Reading The Display

    Reading the Display The DLI 100 Light Meter has 4 LEDs that are used to indicate differ- ent levels of light - both intensity and Daily Light Integral (DLI). Numbers to the right of the LEDs are used during the Light Gather- ing Period to indicate current light levels in µmol·m ·s (micromoles) or fc (foot candles - using the sunlight approximation...
  • Page 7 1000, the next number up). The footcandle range would be 3750-4999. In DLI Display mode, by reading to the left, the DLI value would be in the range 15-19 mol·m ·d (“15” is between the two lit LEDs, and the top of the range is less than 20, the next number up).

  • Page 8: Light Intensity

    Light Intensity The light that drives photosynthesis in plants is Photosynthetically Active Radiation, or PAR light. This is also referred to as Quantum light, because it is measured in units of moles striking an area over time. Though PAR light ranges from 400 to 700nm, the region brightest to human eyes is the area of least effect on plants.
  • Page 9 Effect of light intensity on whole-plant photosynthesis Generally, the net photosynthetic rate of a growing plant increases as light intensity increases (Figure 1). The light intensity that corresponds to a net photosynthetic rate of zero is known as the light compensation point. As light intensity increases so does the net photosynthetic rate of the plant until the light saturation point is reached.

  • Page 10: Cumulative Light (Dli)

    Cumulative Light (DLI) If photons were raindrops, light meters would show the intensity of a rainstorm. A five-minute rainstorm may look impressive, but often provides less water than an all-day drizzle. As cumulative rainfall is measured with a rain gauge, the cumulative quantity of light is measured using the DLI 100, or a light sensor with a data logger.

  • Page 11: Replacing The Battery

    New Guinea impatiens and petunia. HortScience 43:2052-2059 Replacing the Battery The LightScout DLI 100 Light Meter uses a standard 3V Lithium CR2032 battery. A battery is projected to record 60 days, depending on the measured light intensity.

  • Page 12: Warranty

    Warranty The LightScout DLI 100 Light Meter is warranted to be free from defects in materials and workmanship for a period of 1 year from the date of original purchase. During the warranty period, Spectrum will, at its option, either repair or replace products that prove to be defective.

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