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I use an SF4000 in a 3x3 tent, dimmed to 333 watts from the wall, with drivers cooled by a 9" fan on low.
The light's hung 42" from the soil line for seedlings. Vegging plants are generally 35" away. Flowering plants stretch up to 24" away.
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@conradthepeaceful on instagram, he runs 4x sf4000 in a 10x10 on full power - this seems more similar to your setup.