Grow Light High

Grow Light High
How high should I mount my T5 grow light?

I've have a Hydrofarm T5 Grow light rated at 454 watts with a maximum output of about 40,000 lumen. I want to achieve 10,000 lumen for my garden. How high should I hang the light fixture above the plants? I've had a hard time finding a lumen fall-off chart for a 4 foot - 8 lamp system. Can anyone help me out?

Around 4' above the plants.

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