To compensate for the shorter duration of the light cycle, I added an additional HPS HID light, taking the light intensity from 66.66 watts per square foot to 83.33 watts per square foot. My logic was that by changing the light cycle from the standard 12/12 to 9/15 I had reduced the daytime by 25%, and by adding the additional intensity I had added that 25% back into the equation.
So theoretically the plants got the same amount of energy as they had before, but in a shorter period of time. This worked perfectly for the Thai strain I was working with.
Thanks for sharing your experience with us, Kind.
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