How much power is too much?

I lost my Viperspectra 1000 watt light. I got this Spider Farm light and I think I had it way to close to my plants as most of my clones looked like crap. I moved it up 20 inches and turned it to 75% . I guess it ll take me awhile to get used to this light. I was wondering how far u guys keep this light away from clones and seedlings???

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