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Yes it will reduce the wattage. that Io dial controls the current and Vo controls the voltage. It does not matter which one you turn and it will reduce the wattage, but I prefer to set voltage max and control current 'cos in my head it sounds better option. 👌

i had a similar experience with my new leds , turns out i could have them at 60cm high with no stretch, now when i do the math i see i could probably have the same environment but twice as many plants per light as the last grow. Bottom line is that it's less a matter of pure science in the home grow and more a matter of feeling, just keep adjusting until you find the balance that your grow needs. Think of it this way : anyway you need to adjust weekly and sometimes daily as the plant grows, so might as well start responding to that now. Hope this helps ! 🚀