Sounds like a good plan but you said one of the plants was in a medium with no nutrients? That one is going to need some nutes. Even if you just top dress with some earth worm poop. I really wouldnt be afraid of running the big light. These girls sprouted under a 100$ LED and when they were the size of your plants, i turned the 1000w HPS on.
If you want to be on the safe side with the SF2000, hang it like 4 or 5 feet up and then drop it 6-12 inches a day as long as nothing crazy happens.
The day the led went off and the HPS went on.
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4 days later.
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Finished product (autos)
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