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Ho anch'io una niello 900 e nella fase di plantula la tengo a circa 110 cm per la prima settimana di vita poi abbasso gradatamente fino ad arrivare a 50-60 cm e mantengo la distanza fino al raccolto
I’m assuming that’s not an actual 900W fixture but more like 100-200w.
It will probably be fine for seedlings - it’s got a lot of blue in it.
I’d hang at 36” just to be safe and adjust lower if they’re stretching too much