SPSS 3995 Study Guide - Midterm Guide: Electromagnetic Spectrum, Color Temperature, Photosynthesis
17 May 2019
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Document Summary
Visible light is a portion of the electromagnetic spectrum that is visible to the human eye. Color temperature is measured in degrees kelvin (k) and is more for us humans than the plants we are trying to grow. In cannabis, increased uvb levels results in increased thc levels. Why do plants contain different pigments? (hint, think of the antenna pigment molecules. ) Allows multiple wavelengths to be utilized by the plant for photosynthesis. 0-6 hours of darkness; 18-24 hours of continuous light. 12 hours of darkness, 12 hours of light. Plants can only tell the continuous hours of darkness. Par; lumen just measures what the human eye can see, not what is beneficial to the plants. A light may have a very high ppf but a low ppfd if a reflector is not used. Measures how many photons are hitting your plant; spot measurement. As a plant ages (from seedling to vegetative, to flower) the light requirements tend to.
