I did a side by side test where I put 4 clones in 24 hours light and 4 other clones from the same mother on 18/6, and after 8 days 3 out of my 4 (24hrs) clones were showing roots down the bottom. After 9 days all of the 24hrs clones had roots showing and only 1 of my 18/6 clones showed roots. After 11 days all clones had rooted.
It may be small diference but after that experiment I came to the conclusion that no night cycle was needed for rooting clones and that 24hrs light was the best to use for rooting clones.
Anyways when my clones are ready for vegetative growth, I do use 18/6 cause it saves on electricity. Not because the "DARK" cycle helps them grow bigger roots.
As stated above:
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The dark cycle (respiration) happens constantly, 24 hours a day.
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