Indoor need some suggestions for my indoor garden and starting auto flowers with old school lighting

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I have an 8x8 tent and plan on growing autoflowering strains only for a while anyway.

I have two old school 600 watt HPS ballasts that will be great for flowering. They are not adjustable for wattage/output and there is no switch for HPS/ML. They are 600 watt HPS ballasts, which seems kind of restricting to me especially run running autoflowers in a single tent.

I do plan on running a larger garden in the 8x8 tent sometimes. Maybe 12 plants total, in 7 gallon pots. Sometimes I won't run as many plants. Depends on what I have for my own personal

I have cool tubes as well. So once my crop is flowering I will put in 600 watt HPS bulbs and run both cool tube fixtures and hook up cool air in and exhaust heat out.

But I am not sure what to do about lighting when I'm working with seedling and the first 3-4 weeks. Would it be OK to put in 400 watt MH lights in those ballasts and raise the lights up high? Or should at some florescent lighting for the first few weeks and then bring in the HPS lighting after?
 
The problem with your hps is not that it is too powerful but that it is lacking in the spectrum plants need for vegetative development. I'm not an electrician, they tell me mixing wattage of bulbs and ballasts is bad. Cheapest solution would be 6500k T5o.
 
They'll just stretch more in veg. The blue spectrum keeps node spacing tight. I know there's more to it, but if that's all you have and you don't wanna worry about spending money, plug 'em in lmao! But as @talkative stated, t5HO are great for seedlings and vegging. PowerVEG makes some great spectrums and even have some UV bulbs.

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