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How Long Do You Leave Grow Lights on in a Greenhouse?

by TUBU

March 12, 2024


Using LED grow lights in a greenhouse can extend the growing season of your plants and increase yields. However, the length of time a grow light is used can affect the growth and health of your plants. Therefore, it is important to know when to use grow lights in your greenhouse.

The ideal amount of time to leave grow lights on in a greenhouse

The ideal amount of time to leave grow lights on in a greenhouse depends on several factors, but generally plants need a balance of light and dark for healthy growth. Here's a breakdown

Minimum light requirement: Seedlings typically need at least 6 hours of light per day, while mature plants may do well with 8-10 hours.

Maximum light recommendation: Even for long-day plants seeking flower or fruit production, exceeding 14-16 hours of grow light exposure isn't recommended. Plants still need a period of darkness for essential processes.

Plant life stage: Seedlings can benefit from extended light periods (up to 18 hours), but mature plants generally don't need as much.

Plant variety: Some plants are naturally short-day plants and may flower prematurely with excessive light. Research the specific needs of your crops.

grow lights

Some additional things to consider

Cost-effectiveness: Running grow light for extended periods increases electricity use. Weigh the potential benefits against the cost.

Light intensity: Higher intensity light can sometimes compensate for shorter lighting duration.

What is a plant grow light?

Plant grow light is a kind of artificial light source, specially used for plant growth. It can simulate natural light, provide sufficient light for plants, promote photosynthesis, increase plant growth rate, enhance plant resistance to pests and diseases, and make your plants healthier.

What are the functions of the Plant Grow Light?

The main functions of plant grow light include:

Promote plant photosynthesis and increase plant growth rate.

Enhance plant resistance to diseases and pests.

Improve plant yield and quality.

Extend the flowering period of plants.

Control the morphology of plants.

How to choose plant grow lights?

Choose a plant grow light whose spectral range covers the spectrum required for plant photosynthesis.

Choose a plant grow light with appropriate light intensity according to the type and growth stage of the plant.

Choose plant grow lights with a long service life to minimize maintenance costs.

Choose plant grow lights with high light efficiency to reduce energy consumption.

Choose plant grow lights of famous brands for better quality assurance.

How to use plant grow lights?

The installation height of the plant grow light should be adjusted according to the type and growth stage of the plant.

The light duration of the plant grow light should be adjusted according to the type and growth stage of the plant.

Safety should be observed when using plant grow lights to avoid accidents such as electric shock.

Artificial Light Plant Factory

What are the common problems with plant grow lights?

Do plant grow lights harm plants?

No, they will not. The spectrum of the Plant Grow Lights mimics natural light and will not harm plants.

Can a grow light replace sunlight?

No. Plant Grow Lights can only mimic natural light, they cannot completely replace sunlight.

Do I need to use the Grow Light every day?

No, you don't. The time you use your Grow Lights should be adjusted according to the type of plant and stage of growth.

About the author

TUBU is an expert in LED light research with more than 10 years of experience in this field. We hope that through our TUBU research, LED lighting technology will become more popular and bring greater convenience and comfort to people's lives.

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