the plants that are having trouble aren't under a gavita, the 1s that are under it are fine i have it about 4ft above
i lolipop them in veg and i use
http://www.gavita-holland.com/index.php/products/proline/item/gavita-pro-1000-de.html so i'm not very worried about penetration, although the lights these plants are under is different
^ "although the lights these plants are under is different"
Ahh okay, I must have missed that. I think 20" should be good but I don't know for sure, never used a 1k.
Just watch for when her leaves dance towards that bulb, you might need to raise it again that first day till you figure out where she wants to settle
and keep adjusting as needed from there. She might perk up and try to reach out with those leaves pointing up at the bulb a few inches or so at first that you will want to compensate for.
I think I actually need a different hood myself.
I went with a Raptor 6", and only run 600 watts.
I was pretty set on getting a Magnum xxxl hood, but when I went to get one, they were out and said hat the Raptor is pretty much the same thing.
This was at Monster gardens and they said nothing about a Raptor hood being better suited for a 1k bulb. I even told them it was for a 4x4 tent.
They had no problem selling it to me. I bought my 600 watt ballast and bulb, fan, ducting, rope ratchet's, and some other gear all at the same time.
Now I'm stuck with this huge hood that I can't return, and I don't plan to put a 1k bulb in it, or grow in a larger area. I want to get a Blockbuster 6"
Not sure if I can trade my Raptor in. I know at monster gardens they do have a section where there is old beat up dented hoods often with no glass.
Mines not dented at all and the glass is perfect so its still got to be worth something.