Diamond XML 150 light questions

I purchased a Diamond XML 150 used so it doesn’t come with an instruction manual.

I don’t know the best way to set the light adjustment? There are 2 knobs to set it. One of them turns on a white light & the other one seems colored like blue to me.

I have seedlings right now so I don’t know how best to adjust the light for seedlings, distance from the light, hours of light, etc. They are “auto flowers.”

You can run both on the way though your grow I have the 350 exact same light

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OK, thanks.