How Much Light Does Cannabis Need ?

Lighting is crucial for healthy cannabis growth. Here's what you need to know about this incredible plant's light needs at different stages of its life.

Vegetative phase :
During the vegetative phase, cannabis needs at least 18 hours of light per day. Basically, the more light, the better. Cannabis is a plant that loves light, so don't hesitate to give it as much light as possible. It can even be grown continuously, 24 hours a day, if you wish because it is a photosynthesizing plant.

Flowering phase :
When cannabis enters the flowering phase when it has 12 hours of light per day. This is when it will begin flowering and after 1 to 2 weeks the first filaments will be visible.

Important tip :
Cannabis is sensitive to night time. Indoors, as soon as the nights last more than 6 to 8 hours, the plant begins to enter the flowering phase. Outdoors, this transition is more gradual and depends on the lengthening of natural nights.

What about different light sources, How many lumens for your cannabis plants?

• High pressure sodium (Vegetation + Flowering) - HPS :
• Cloning : Rarely used
• Vegetation: Metal-halide lamp from 400 to 600W with enhanced blue spectrum
• Bloom : HPS from 600 to 1000W with enhanced red spectrum
• Light-emitting diodes (Cloning + Vegetation + Flowering) - LED :
• Cloning : Low power LED (18-24W) with a blue spectrum (6500K)
• Vegetation : Moderate power LED with full spectrum leaning toward blue (4000K to 6500K)
• Bloom : High power LED with full red-leaning spectrum (2700K to 3000K)
• Neon (Fluorescent Lights): (Cloning + Vegetation) :
• Cloning : Low power fluorescent tubes with a blue spectrum (6500K)
• Vegetation : Fluorescent tubes with a spectrum around 4000K to 6500K
• Bloom : Rarely used due to low light intensity

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