Different spectrums of light

Hello, I’m in the flowering stage of a northern lights autoflower. I’m actually comming up on week 8. Buds seem to be growing slow so I’m gonna give it another week at week 7. Was wondering if I could add the blue spectrum light along with to red, or will that slow down growth. I know it’s good for tricombs.

You could? Pictures help, and this is the slowest part of the grow.

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