What Amount Of Light Do Cannabis Plants Need To Grow?

Posted bybreederscollectivePosted inAll Blog Posts, Cannabis Grow Lighting, Cannabis Growing
What Amount Of Light Do Cannabis Plants Need To Grow?

What Amount Of Light Do Cannabis Plants Need To Grow?

The light intensity needed to grow cannabis depends on the stage of growth that the plant is in. During the vegetative stage, cannabis plants require higher light intensity than during the flowering stage. The optimal light intensity for each stage of growth is measured in units of PAR (Photosynthetically Active Radiation), which refers to the amount of light energy that plants use for photosynthesis.

Here is a breakdown of the recommended light intensity for each stage of growth in the cannabis life cycle:

Seedling stage:

During the seedling stage, cannabis plants require low to medium light intensity to avoid damaging the young and delicate plant. The recommended PAR range for seedlings is between 100 and 250 micromoles per second per square meter (µmol/s/m²).

Vegetative stage:

During the vegetative stage, cannabis plants require higher light intensity to encourage strong growth and development. The recommended PAR range for vegetative plants is between 400 and 600 µmol/s/m². It is important to note that too much light can also cause damage to the plant, so growers should monitor their plants closely and adjust the light intensity as needed.

Pre-flowering stage:

During the pre-flowering stage, cannabis plants require a 12/12 light cycle, which means 12 hours of light and 12 hours of darkness each day. The recommended PAR range for pre-flowering plants is similar to the vegetative stage, between 400 and 600 µmol/s/m².

Flowering stage:

During the flowering stage, cannabis plants require a slightly lower light intensity than during the vegetative stage. The recommended PAR range for flowering plants is between 600 and 1000 µmol/s/m². It is important to note that some strains may require higher or lower light intensity, so growers should monitor their plants closely and adjust the light intensity as needed.

It is also important to note that the light intensity can vary depending on the type of grow light being used. For example, LED grow lights may require a lower light intensity compared to traditional high-pressure sodium (HPS) lights. Additionally, the distance between the plants and the light source can also affect the light intensity, with closer plants receiving more intense light than those further away.

In summary, the light intensity needed to grow cannabis varies depending on the stage of growth, with seedlings requiring low to medium light intensity, vegetative plants requiring higher light intensity, pre-flowering plants requiring similar light intensity to the vegetative stage, and flowering plants requiring slightly lower light intensity than the vegetative stage. Growers should monitor their plants closely and adjust the light intensity as needed to ensure optimal growth and development.

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