Basics of light spectrum, light (radiation) wavelengths, visible v. invisible light, the inverse square law, lux, watts and how ALL of these impact your marijuana growing! Like I said, huge topic. And to be clear, the advice given here is useful for all plants and teaches you about what green plants with a flowering period require especially.
My Grow Gear shop:
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Cannabis Breeding Basics episode:
LED LIGHTS OVERVIEW EPISODE:
My UV light basics episode:
Light Cycle Basics & Blackout Advice: