I'll say flat out that i don't know who is right and who is wrong but here is another "opinion"...
From a marijuana expert/advocate Ed Rosenthal's "The Best of Ask Ed":
Quote:
Marijuana plants photosynthesize as long as they receive light as well as water, air, nutrients and suitable temperature. Photosynthesis is the process in which plants use the energy from light (primarily in the blue and red spectrums) to combine carbon dioxide (CO2) from the air and water (H2O) to make sugar while releasing oxygen to the air.
Plants use sugars continuously to fuel metabolic processes (living) as well as for tissue building. The plant combines nitrogen (N) with sugar to make amino acids, the building blocks of proteins. They are the substance of plant tissue. When the light is off, the plant’s metabolic processes, respiration and growth continue.
The marijuana plant can photosynthesize continuously, so it produces the most energy and growth when the light is on continuously. Continuous light does not stress the plant, which reacts somewhat mechanistically. Plants can suffer from the heat emitted by lamps, but will not undergo stress due to continuous lighting.
Plants under an 18/6 light/dark regimen are producing sugar only three quarters of the time. They are thus growing at only 75% of their potential. Leaving the light on continuously will result in bigger plants faster, which leads to higher yields.
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