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  1. questionWhat are the differences between Quantum Light and Solar Radiation?
    The range of wavelengths that plants use is called Photosynthetic Active Radiation (PAR). This is measured in units of micro-mol per metre squared per second (umol/m2/s) which is usually called Photosynthetic Photon Flux Density (PPFD). At midday in mid summer the sun can reach around :- 2000uE ...

  2. questionHow to calculate Daily Light Integral (DLI) with a Quantum Light Meter
    Here is the formula for calculating DLI with a quantum meter. μmol m-2s-1 x (,3600 x photoperiod) / 1,000,000 = DLI - μmol m-2s-1 is a reading, or averaged readings, from the quantum meter - 3,600 is the number of seconds in an hour - Photoperio ...

  3. questionWhy do my values vary under fluorescent lights when using the PAR Light Sensor (Item #3668I)?
    When using the PAR Light Sensor (Item #3668I) and measuring under fluorescent lights values may vary because fluorescent lights flicker on and off 100 or 120 times per second. The sensor value depends on the precise instant when the reading is taken. Because the values are averaged, the varia ...