How Many Hours a Day of Light Do Marijuana Plants Grown Indoors Need?

New to marijuana growing. How long should I turn the light on?

Germination: 5 to 10 days, 18 hours of light and 6 hours of darkness.

Seedling: 2 to 3 weeks, 8 hours of light and 6 hours of darkness.

Vegetative: 3 to 16 weeks, 18 hours of light and 6 hours of darkness.

Flowering: 8 to 11 weeks, 12 hours of light and 12 hours of darkness.

MORE: How’s the 24/7 Light Cycle for Auto-flowering Marijuana?

What Others Are Asking

Are LED Grow Lights a Fire Hazard?

I bought some LED grow lights and intended to leave them on when I left for work. But I have a cat and was afraid a fire would catch on and I might lose him. I wanted to make sure no one had this poor experience.

How Do I Know My Grow lights Are Harming My Plants?

This is a first-time grower. I received my friend’s old grow lights. They are square panels with bottom-mounted blue and red LEDs. The issue I’m having is that they have absolutely no labels, thus I have no idea how effective they are. How can I tell whether these lights are damaging my plants?

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