m0useanswered grow question 2 years ago 1000W light, dam gone Nuclear. That's packing some serious power.
Your diary says your using a 600w HID style light so that's confusing.
So for a 1000W I would dim brightness to 30% and hang height of 25-30" that is if its a true 1000W light, some amazeon lights say 1000w but really they are only pulling 150W, you would be best to post a link of the light you are using.
The manufacture will have some suggestions so you should 100% check the Manuel for some of this information
If this was a typo and its a 100W led I'd bring it down to 25" no dim.
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Best Of Luck!