Light spectrum affects the growth of plants – This is how GROWLIGHTENGINE® differs from others

The kind of light a plant receives is extremely important. The GROWLIGHTENGINE® LED spectrum, i.e. the spectrum of light, consists of an optimized mixture of colors for growing healthy and well formed plants from seed to flowering.

In a previous blog, we talk about how GROWLIGHTENGINE® makes use of technology. In this text, we discuss the spectrum of greenhouse luminaires and their differences as well as the spectrum of a GROWLIGHTENGINE® greenhouse luminaire.

Most greenhouse luminaires, also known as grow lights, are designed in a way that the spectrum can be changed according to the growth phase of the plant. We, on the other hand, optimize our spectrum to suit all plants through all their growth phases. This makes your job as a grower easier with you not having to adjust the spectrum. We have designed the spectrum together with hydroponic professionals and worlds leading LED technicians to suit all plants at all stages of their growth.

The spectrum of GROWLIGHTENGINE® is something that you’ll have to experience yourself and now we are going to explain why.

What you should know about grow light spectrum?

In addition to light, the growth of a plant is affected by a lot of other factors such as humidity and nutrients. However, it is extremely important what kind of light the plant is given.

What does the spectrum of light mean?

The spectrum of light can be seen, for example, as light passes through a prism. Different wavelength of light is refracted in different ways and the eyes distinguish them in different colours. The short-wave end of the visible light is purple and the long-wave is red. It covers the wavelength range of 390 to 720nm. The sensitivity of the human eye is highest at 555 nanometres, which is equivalent to green light.

Source: Wikipedia

Usually, when talking about the spectra of grow lights, it is roughly divided into blue, green and red areas. These areas affect the plants in different ways. We don’t yet know everything about spectra and how they work but research gives some direction to where it’s headed.

Below are the spectrum divided from the most to least important:

  • According to study by NASA, the red area (600-700nm) is the most efficient and important for the growth of plants. It has many effects on plant development. It enhances stem and leaf growth, plant mass, and affects plants flowering and germination.
  • The far-red (700-800nm) is also a very important area, especially for flowering plants. Plants that require a long period of light to flower bloom faster when there is a little far-red in the spectrum. Like the green light, the far-red penetrates the top layer of the leaves o the plant, but it has the most effect on all the germination, seedling stage and flowering of the plant.

  • The blue area (400-500nm) is the second most important spectrum. It affects the growth of the plant stems and leaves and is essential for seedlings and young plants during vegetative phases. Approximately one third of sunlight PAR emissions consist of blue.
  • The green area (500-600nm), a highly debated controversial topic. On the other hand, is believed that green in the grow light spectrum is not that important for the plants as the plant reflects green light and is therefore is not able to utilize all parts of it. However in the right amount used, the plants benefits from the green and it is absorbed by the plants. According to a study made by NASA, some areas of the green spectrum may even be more efficient than certain areas of the blue spectrum.

    The good side of the green spectrum is that when combined with red and blue, the human eyes see the light as white. This helps in monitoring the crop when the color of the leaves, flowers and fruits of the plants look real. When the light consists of only blue and red, the plants will appear purple, grey, or even black. That would, for example, make it difficult to detect quality control or plant diseases.

How many kelvins do our LEDs have?

We often get questions about how many kelvins our LED has, in other words, what is the colour temperature of our LED. In greenhouse lighting, it is also possible to use ordinary LEDs, for example: 4000K, but it is not the most efficient option.

LEDs of this type are primarily intended for conventional lighting; in which case their design does not consider the needs of the plants.

The LED spectrum of our grow light is designed for plants. It does not follow ordinary colour temperature; therefore, we cannot talk about kelvins.

How GROWLIGHTENGINE® is better than other greenhouse lights?

Most LED grow lights are pink in colour. The spectrum of these luminaires is located only in the red and blue range. As previously compared, this type of spectrum is not the most effective for growing plants and the pink colour makes it difficult to work in it and monitor the production.

Figure: On the left is a regular LED grow light, on the right is GROWLIGHTENGINE®

It is easy to work under GROWLIGHTENGINE® grow light as its light is almost white. It is also safe for the eyes as long as you do not directly look at the light source.

Figure: The light in GROWLIGHTENGINE® grow lights are almost white

How to choose the best grow light for you and your plants?

Now that we have delved into the world of spectra and the effect of each spectral range, you are sure to wonder how in the world to choose the right grow light for your plants.

With the GROWLIGHTENGINE® luminaire, the contemplation has already been done on your behalf as its spectrum is designed to suit all plants at all staged of their growth. It has just the right combination of red, blue and green.

You don’t have to worry. Whether you grow lettuce, tomatoes, cucumbers, or anything, GROWLIGHTENGINE® is for you.

If you have any questions, you can always email us at sales@growlightengine.com. We will be happy to help you.

This blog used NASA’s research as reference. Link to the research

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Terms and conditions

These delivery terms are valid from 20.4.2020 .

GROWLIGHTENGINE® – e-commerce store delivery terms

GROWLIGHTENGINE® e-commerce store is maintained by Arrant-Light Oy.


VAT: FI05805430

Address: Rajakivenkatu 8, FI-20740 Turku

Customer service number: +35822462300

Customer service email: help@growlightengine.com

The following terms and conditions will be applied to the relationship between GROWLIGHTENGINE® and its e-commerce customers. GROWLIGHTENGINE® reserves the right to change and update the terms and conditions unilaterally without notice.

GROWLIGHTENGINE® is not liable for damages or delays caused by force majeure. Force majeure covers all unforeseen and overwhelming obstacles and conditions that GROWLIGHTENGINE® couldn’t have forecasted or have an impact on (and cannot solve reasonably) GROWLIGHTENGINE® is liable to inform the e-commerce customers about this type of delays immediately.

Customer information

Applicable Finnish and EU legislation concerning consumer trade, marketing and advertisement will comply between GROWLIGHTENGINE® e-commerce and its clients.

When ordering, the e-commerce customer must provide complete contact information, including at least the name, address, telephone number, and e-mail address. An e-commerce customer may choose to register to create a customer-specific account, but this is not a prerequisite for ordering.

The information of e-commerce customers is used to maintain the customer relationship and the information is stored at GROWLIGHTENGINE®'s customer register. GROWLIGHTENGINE® has prepared a data protection statement in accordance with the Data Protection Regulation, which is available at www.growlightengine.com/privacy. The e-commerce customer has the right to prohibit the use (and processing) of their data for marketing purposes and to see their own data. In these situations, you should contact GROWLIGHTENGINE® e-commerce customer service support (help@growlightengine.com).

Placing an order

The payment service provider is Paytrail. Paytrail is Finnish online payment provider. The payment options are invoice, installment payment, card payment, and online banking payments. Available options for you depends on your country.

By providing information at the checkout, you accept the terms and conditions of Paytrail (Paytrail Oyj, Innova 2, Lutakonaukio 7,40100 Jyväskylä, www.paytrail.com). By clicking on the “Buy” button you agree to our general terms and conditions.

Payment and payment methods

Once we receive your order, we will immediately email you an order confirmation showing your order details. Always check the contents of the order confirmation. If you have any questions, please contact our customer service immediately (help@growlightengine.com). Save your order confirmation if you need to contact customer service. When dealing with customer service, always keep your possible customer number and order number available. Always check that the contents of the package match the products on the order confirmation.

Prices are in euros (€) and include VAT (24%). GROWLIGHTENGINE® reserves the right to review and correct both product and freight prices. The delivery price depends on the chosen mode of delivery.

Order- and Payment confirmation

Once we receive your order, we will immediately email you an order confirmation showing your order details. Always check the contents of the order confirmation. If you have any questions, please contact our customer service immediately. Save your order confirmation if you need to contact customer service. When dealing with customer service, always keep your possible customer number and order number available. Always check that the contents of the package match the products on the order confirmation.

Prices are in euros (€) and include VAT (24%). GROWLIGHTENGINE® reserves the right to review and correct both product and freight prices. The delivery price depends on the chosen mode of delivery.


Our products are shipped from Finland.

At the moment we ship to the following countries:
Andorra, Austria, Belgium, Bulgaria, Croatia, Denmark, England, Estonia, France, 
Germany, Greece, Hungary, Ireland, Italy, Latvia, Liechtenstein, Lithuania, 
Luxembourg, Monaco, Netherlands, Northern Ireland, Norway, Poland, 
Portugal, Romania, San Marino, Scotland, Slovakia, Slovenia, Spain, 
Sweden, Switzerland, Czech Republic

If your country is not listed above, please contact us.

Standard delivery cost is 28€ (*).

*By creating an account on our website you will get free shipping.

Common delivery times vary depending on the size of the order. Normally orders will be sent within a week unless otherwise stated.

The delivery times vary depending on the country. In Finland, delivery times are 3-5 days. In Europe 1-2 weeks.

We are not responsible for delays or possible inconveniences caused by force majeure. The online store informs about abnormal delivery times on its website.


If you want to return your GROWLIGHTENGINE® please contact us at help@growlightengine.com for further instructions.

Right of withdrawal

You have the right to cancel this agreement within 14 days without giving any reason. The withdrawal period ends within 14 days starting from the day you received the last shipment, or in the case of downloadable products, from the moment you received the order.

In order to exercise the right of withdrawal, you must notify us of your decision to cancel the agreement in an unambiguous way (for example, by mail or by email). You can also use our printable return form, but its use is not mandatory.

To comply with the deadline for withdrawal, it is sufficient that you submit your notice of cancellation before the end of the withdrawal period.

Effects of withdrawal

If you withdraw from this contract, we shall reimburse to you all payments received from you, including the costs of delivery (with the exception of the supplementary costs resulting from your choice of a type of delivery other than the least expensive type of standard delivery offered by us), without undue delay and in any event not later than 14 days from the day on which we are informed about your decision to withdraw from this contract. We will carry out such reimbursement using the same means of payment as you used for the initial transaction, unless you have expressly agreed otherwise; in any event, you will not incur any fees as a result of such reimbursement.

You must return the goods without delay and no later than 14 days after informing us about your decision to withdraw from the contract. The deadline is met if you send back the goods before the period of 14 days has expired.

You are only responsible for the kind of value decrease of the goods that did not result from treatment that is required for determining the nature, properties and functionality of the goods.

Unclaimed deliveries

Unclaimed delivery is not comparable to customer return or cancellation. We will charge the relevant delivery costs for all unclaimed orders if the customer hasn’t placed a cancellation.


If the order is lost or damaged during the transport or does not otherwise correspond to your order, you must report the error within 14 days in writing to the address mentioned in the Right of Cancellation and Return Policy or by calling the telephone number mentioned in the contact information. If the package is clearly damaged in transit, you must immediately make a complaint to the shipping company of your choice.

Warranty Terms

GROWLIGHTENGINE® products are manufactured with great care and are subject to strict quality control before leaving to the customer. If nevertheless, defects in material, installation or manufacturing are found in the device supplied to you, they will be repaired at our discretion, either free of charge or by replacing the defective device with a new one, at our discretion. Normal wear and tear due to use is not covered by the warranty.

In the event of a warranty claim, contact your GROWLIGHTENGINE® dealer or if bought from GROWLIGHTENGINE® official web store contact us at help@growlightengine.com. The warranty is only valid upon presentation of a purchase receipt showing the seller's name and address, equipment type and date of purchase.

The GROWLIGHTENGINE® warranty is valid for new equipment sold in the European Union and is subject to Finnish law. The guarantor is GROWLIGHTENGINE®, Rajakivenkatu 8, 20740 Turku, Finland.

For consumers, the warranty expires after three years (*) from the date of delivery of the device.
(*) By registering, the warranty is five years from the date of delivery of the device. 

If the device is used for professional or similar purposes or purchased in the name of a company, the warranty is valid for three years from the date of delivery of the device. 

If the device you have purchased is defective, you have all the statutory rights to make claims against the seller under the sales contract. These rights are not limited by the warranty provided by GROWLIGHTENGINE®.

Finnish law applies to all disputes between the customer and GROWLIGHTENGINE®.

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