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The Problem With Using Grow Lights in Greenhouses

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When it comes to lighting a greenhouse, nothing works better than natural light. If you use your greenhouse to grow plants in winter, or if the structure or placement of your greenhouse limits the light that enters it, you may need supplemental light. Be aware that the wrong kind of light can stunt plant growth.

Not Enough Light

A common problem with greenhouse lighting is not enough light. If plants don’t get enough light, they tend to stretch, growing ever higher, seeking more light. Light-starved plants become spindly and top-heavy. Energy that could go into leaves, flowers and fruit goes into stems, and the plant weakens as a result. Getting plants enough light involves making sure the artificial bulbs have a high enough wattage. It also involves making sure the light is close enough to the plant. For seedlings especially, the light should be only 1 to 2 inches from the bulb.

Too Much Light

Plants can get too much light. During the day, plants use light and water to make starches and oxygen. At night, the plant converts those starches to sugars and stores them. One of the problems with greenhouse lighting is that it can be left on around the clock to spur fast growth, but doing so compromises the health of plants. Plants given too much light become pale, sometimes sunburned. A period of roughly eight hours of darkness each night helps plants maintain their health.

The Wrong Kind

Plants use mostly red and blue light for photosynthesis. High-pressure sodium lights put out most of their light in the yellow range, which is virtually unusable by plants. Incandescent lights put out wider range of light, but they put out heat, something that can harm small, tender plants. Metal halide and fluorescent tubes are better choices. They are cool and efficient and they put out light the plants can use.

Uneven Distribution

Uneven light means some plants will grow well while others languish. Though different plants have different light requirements, in general, greenhouse lighting should provide 20 to 40 watts of light per square foot, spread evenly across the growing surface. That light must also be able to reach all the leaves. Plants that are spaced too closely will have some leaves that are shaded all the time.

The Problem With Using Grow Lights in Greenhouses. When it comes to lighting a greenhouse, nothing works better than natural light. If you use your greenhouse to grow plants in winter, or if the structure or placement of your greenhouse limits the light that enters it, you may need supplemental light. Be aware that …

Greenhouse LED Grow Lights

When you look up in modern lighted greenhouses in West Europe you have for sure seen our lamps already.

Already back in 2017 we came on the market with the first LED grow light able to replace a 1000 watt HPS SON-T.

In that time most LED grow lights still looked like a light bar and were placed on a bunch of extra C-profiles in the greenhouses, creating tremendous investments per meter and a lot of extra shadow on the crops.

We decided to do it different…

Our LED grow lights for greenhouse supplemental lighting are made with a lot of vision. We aim in each crop and growers project for an optimum balance between investment and operational costs.

We don’t believe in a “one product serves all” – each region, each crop, each growth stage,… has it’s specific ins and outs you need to be aware of in order to provide the perfect grow light product.

While in one region energy is almost for free, in another region energy can be the major cost driver in a grow light project.

Therefore we have developed a wide range of LED grow lights for greenhouses, each with its specific purposes and benefits.

In the majority of our projects you will see our flagship the CoolStack® in LED or hybrid lighted greenhouses.

The CoolStack® is the most powerful and modular LED grow light which is today available on the market.

Directly placed under the greenhouse trellises and with and ultra-small width, we guarantee a minimum of extra shadow on the crops.

What makes the CoolStack® the ideal LED grow light for your greenhouse project:


4 different power and light outputs guarantee the ideal match for the needed light level of your crops with a minimal number of light fixtures and an ideal light spreading.

A good example of the benefits of this approach is our CoolStack® Boost system in strawberry greenhouses.

With just 2 lamps of the CoolStack® Boost per 8 meter trellis for an early-late strawberry cultivation we have reduced the investment cost per square meter for the growers with over 25%.

CoolStack® LE
up to 1820µmol/s from 530 watts
CoolStack® HO
up to 2070µmol/s from 600 watts
CoolStack® BOOST
up to 2950µmol/s from 880 watts
CoolStack® MAX
up to 3520µmol/s from 1025 watts
The ideal light distribution per crop with intelligent lens beam angle design

There are tremendous differences between a high wire crop project where the lamps are less than 2 meters away from the top of the crop and for example a lettuce project with 4 meter from lamp to crop.

Just spreading the light in the widest way is of course the easiest solution and gives in many cases a good even light spreading, but is far from ideal with regards to light penetration in the crop.

We have developed a wide score of different beam angles and beam patterns to give you the ideal light distribution and deepest crop penetration per project.

MechaTronix developed a wide range of LED grow lights for greenhouses – CoolStack®, each with its specific purposes and benefits. The CoolStack® is the most powerful and modular LED grow light which is today available on the market. Directly placed under the greenhouse trellises and with and ultra-small width, we guarantee a minimum of extra shadow on the crops.