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Everything radiates heat. I protect slightly tender plants in my greenhouse by putting newspaper over them during freezing conditions, to reflect the heat back to them. It seems to work.
3. Wikipedia states about 5% incident light is converted - so plant can count on about 70W/m^2 during sunlight hours.
Quote from: imatfaal on 11/01/2011 17:05:253. Wikipedia states about 5% incident light is converted - so plant can count on about 70W/m^2 during sunlight hours.There would be 3 types of heat & energy.Reflected light. (Green?) It never gets absorbed, but is reflected back from the original light/energy source.Energy absorbed as HEAT. I.E. 5% is absorbed as energy. The other 95% has to go somewhere... I.E. either HEAT or reflected energy. Especially in the summer. While plants are often cooler than asphalt, for example, this additional energy has to go somewhere. I believe that plants are supposed to have some internal temperature regulation.Metabolism. Energy absorbed by the chlorophyll, and used to power the plant, and probably also radiated as part of the metabolic process