If you have a dimmable 600/750/1000 watt MH / HPS, when do you change wattage?

Indoor Growing Lighting
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Does it matter if heat is not an issue?

I have the Vivosun dimmable ballast that switches from 600 to 750 to 1000 watts and takes a metal halide and HPS bulb.

After I ran the 6" inline fan that kicks on due to temperature into the attic there were no heat issues, it’s winter, but I have 55 F to 79 F temperature range per day.

This is my first grow with this light, so I used the MH at 600 at first, then did 600 HPS, 750 HPS and then 1000 HPS. I think I just wasn’t sure about light intensity burn.

So could I have started with 1000 watts or is that going overboard? Electric bill wise doesn’t matter, it only changed by $20-$30/month.

Graph below is my current grow, the photo below is from today.

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Im no help but that is a good question ima tag along

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Guess no one knows. I did 600 for vegetative, then 750 when I started flowering, then up to 1000 about 3 weeks into flowering. No light burn happened, ducting into the attic causes no heat issues as long as the light is 16"+ from the tallest part of any plant.

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wow. that’s some hot watts. Great looking girls!

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First time using this light, and it’s the best looking grow I’ve ever had after about 10 grows total. Hopefully it works out in the end.

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Congrats. you must be doing it right.

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As long as you have the co2 in the room, 1000 watts is good. I ran mine at 75% and produced some nice plants for years, but I had heat issues.