Something strange happening here, what it is ain't exactly clear

Well for one i would take the 5 minutes to calibrate the meter. You have no idea how far out it is.

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It looks like dialing down the light a bit stopped it. I raised it up and started using the dimmer to adjust light level more so than moving it up and down. Thanks.

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True watts and LUX (PPFD conversion) are required to know your grow input and output.
Factory defects, not withstanding, learning the dimming characteristics helps shape your grow.