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Why grow with LED?
■ Because (high-end) LEDs offer a complete spectrum in which the most important wavelengths (expressed in nanometer, nm) are represented. For example: HPS lights mainly emit colors that are least favorable / effective for plants like yellow and orange light.
■ Improved light spectrum, specifically designed
■ Excellent fruit quality with more terpenes, giving a better effect, (fruit)color, aroma and taste compared to HPS, LEC, CDM, CMH or Plasma lights
■ Boost active substances and increase plant specific characteristics
■ Higher value crop harvests due to improved quality
■ More usable light, less heat than HPS, improved grow room conditions. Grow all summer long!
■ Less energy consumption, lower running costs compared to HPS and reduced cost on cooling/air conditioning (HVAC)
■ Silent and maintenance free with hardly any loss of light intensity during product lifetime
■ 50.000+ hours guarantee. No replacement bulb costs ever
■ Safe to use and easy to grow with
How do I choose the perfect LED?
To ensure that your investment in an LED grow light meets your cultivation and production goals, you need to know what manufacturers mean by PAR, PPF, PPFD, and photon efficiency to make an informed purchasing decision. However, these three metrics should never be used as sole variables to make a purchasing decision.

There are several other variables that need to be considered as well, we will explain these later on:

■ your goal: Are you germinating (seeds), are you growing seedlings, cuttings or mother plants; do the crops remain in the vegetative phase, or do they flower as well? Do you aim for the highest yields possible or do you have medicinal purposes in mind (we recommend spectrum control for the best medicinal endproducts)? The plantphase will mostly determine your final choice. Please read a more detailed explanation in section 3.
■ coverage area: The size of the surface that you want to illuminate used to determine the required wattage (to a large extend). Wattage used to tell you ''how much light'' would be emitted. This is not the case with LEDs (and lighting sources in general) as PPFD tells you how much usable light is actually emitted on the surface of your plant(s). Please read a more detailed explanation in section 2.
■ the spectrum: Determines for what kind of plant(s) and for which phase(s) of the(se) plant(s) the fixture is best suited (for Germination, Clones, Motherplants, Vegetative and/or Flowering). Every wavelength / color has a different effect on plant development and photosynthesis. Plants are in need for different wavelengths / colors in different phases (germination, cloning, vegetative and flowering) and ratio's. Please read a more detailed explanation in section 3 or the complete information here: https://ledbypassion.com/spectrum.
■ your personal health: Does your health allow you to work on your knees, to bend and to ''SCROG'' for example? Does it allow you to lift heavy lights (15 – 20 kg) or do you prefer to work with lightweight LED bars?
■ your growing method: We recommend different lighting systems for several growing methods; some LED systems need to be used at a close hanging distance (the distance from your light to the top of your plants) and other lights are used at a high hanging distance. So it depends on the method of growing you prefer.
■ your grow environment: Temperature, humidity, air circulation, background noise and your living situation for example (HVAC) can influence your final choice. For example: you don't want any noise (caused by active thermal management) if you are growing in your bedroom.

All factors need to be taken into consideration to select the most appropriate system based on your cultivation and business goals, and the take home message is that PPF, PPFD, and photon efficiency are the proper metrics used by scientists and industry leading horticulture lighting companies. If a company does not provide you with the correct metrics used for horticulture lighting, they should not be selling horticulture lighting systems, and you will not be able to verify the true efficiency of their system.
How many watts do I need?
Space availability is a vital factor when purchasing lighting as it determines the amount and size of lamps you need. The first thing you need to do is measure the exact size of your garden. Then you need to find out the coverage area of the lights you're considering in order to determine the exact number you need. The recommended and maximum coverage area is mentioned in the discription of every light in our collection. The general guideline most growers use is that you need 32 watts of actual power per 30 cm² if you're growing high-light plants like tomatoes. Low-light plants like lettuce need somewhere between 11 and 18 watts per 30 cm².

We recommend different wattages for certain coverage areas, on average:

60 x 60 cm 50 – 200 Watts LED
80 x 80 cm 200 – 400 Wats LED
100 x 100 cm 400 – 600 Watts LED
120 x 120 cm 400 – 800 Watts LED

The recommended and maximum coverage area of a light are different in the vegetative and flowering phase because vegetative plants need a lower PPFD range compared to flowering plants. This means you can illuminate a larger cultivation area during VEG (because the hanging distance can be increased during the vegetative phase) in contrast to the Flowering phase.
Which spectrum do my plants need?
This depends on the plant species and phase the plants are in. We recommend full spectrum LEDs for full cycle grows (a full cycle grow is a cycle from germination/vegetative phase to the reproductive/flowering phase). Full Spectrum lights are illuminaires in which most colors are represented: Blue/Violet, Green, Red and Far Red Light are essential. The addition of other colors of light (full-spectrum light) has been shown to have further benefits for plant growth. This can be done by adding wavelenghts from the UVB, UVA, Yellow, Orange and Infrared spectrum.

Although plants can grow under almost any type of light, efficient photosynthesis requires different wavelengths and some of the best led grow lights can provide plants with the full spectrum necessary throughout each growth.

For example, in order to grow most efficiently, many plants need light in the red, blue and green spectrums, but also infrared and ultraviolet, depending on the stage. A powerful full spectrum LED grow light enables you to cater to the plant's specific needs by providing the proper photosynthetically active radiation values.

Click here for detailed information about the Spectrum, Light and the effect of different colors / wavelengths on high-intensity plants: ledbypassion.com/spectrum

■ Germination (seeds): well-tuned (high) Blue to Red ratio and a small amount of Green, avoid Far Red
■ Clones (cuttings): well-tuned (high) Blue to Red ratio and a high amount of Green, avoid Far Red
■ Vegetative phase (including motherplants): Blue dominant, well tuned Blue to Red ratio and a high amount of Green
■ Pre-Flowering phase: well tuned Blue to Red ratio and a high amount of Green
■ Flowering / Reproductive phase: Red dominant, well tuned Blue to Red ratio and a moderate amount of Green
■ Ripen / Finish: - Last 3 weeks of Flowering / Reproductive phase: Supplemental lighting with UV-B wavelengths for 3-4 hours a day, in the middle of your 12 hour light cycle (the duration of this supplemantal lighting depends on your cultivation and business goals.
- Last 3 days of Flowering / Reproductive phase: ''No Red'' light treatment for Boosting terpenes in high-intensity plants (''Blue Light Treatment'').
PAR,PPF,PPFD and Photo efficiency?
If you have been researching LED horticulture lighting systems, you have likely been bombarded with a variety of metrics that lighting manufacturers use to market their products. Some terms and acronyms you are likely to see include: watts, lumens, LUX, foot candles, PAR, PPF, PPFD, and photon efficiency. While all of these terms do relate to lighting, only a select few really tell you the important metrics of a horticulture lighting system:

■ PAR light is the wavelengths of light within the visible range of 400 to 700 nanometers (nm) which drive photosynthesis.
■ PPF measures the total amount of PAR that is produced by a lighting system each second, in micromoles per second (μmol/s). This is probably the second most important way of measuring a horticulture lighting system.
■ PPFD measures the amount of PAR that actually arrives at the plant, or as a scientist might say: “the number of photosynthetically active photons that fall on a given surface each second, in micromoles per square meter per second (μmol/m²/s).
■ Photon efficiency refers to how efficient a horticulture lighting system is at converting electrical energy into photons of PAR, in micromoles per Joule (μmol/J). The higher this number is, the more efficient a lighting system is at converting electrical energy into photons of PAR.

Click here for detailed information about these metrics: https://ledbypassion.com/lighting-metrics-par-ppf-ppfd-photon-efficiency
How much PPFD do my plants need?
During establishment growth, light intensities need to be kept relatively low as the plant is developing leaves and stems that will be used to provide photosynthates during the vegetative growth phase. Increasing light intensity as you transition into the vegeta- tive and reproductive growth phases will increase the rate of pho- tosynthesis, which will provide the plant with more photosynthates used to develop flowers and subsequent fruit. Plants need time to adjust to high light intensities (referred to as photoacclimation). If you expose plants to high light intensities too early in the crop cycle, you can damage chlorophyll pigments causing photo-oxidation (photo-bleaching), so we recommend slowly increasing your light intensity as your plant develops. Refer to the recommended PPFD ranges for establishment, vegetative, and reproductive growth of high-intensity plants, tomatoes, cucumbers, and peppers.

■ Examples of recommended PPFD (μmol/m²/s):

Species High Intensity Plants
Seed100 – 300
Vegetative Cutting75 – 150
Vegetative300 – 600
Reproductive 600++

Species Tomatoes
Seed150 – 350
Vegetative Cutting75 – 150
Vegetative350 – 600
Reproductive 600++

Species Cucumbers
Seed100 – 300
Vegetative Cutting-
Vegetative300 – 600
Reproductive 600++

Species Peppers
Seed150 – 350
Vegetative Cutting-
Vegetative300 – 600
Reproductive 600++

Wattage actually only matters because there is a maximum PPFD range linked to the wattage of an LED system. Wattage is a metric for input, not for output so the wattage doesn't tell you anything about the light (converted electrical power in wattage) that comes out, PPFD does and is your most important metric. For example: a 600 Watts LED light will have a much higher PPFD than a 600 Watts HPS light. So if you would compare these 2 lighting sources based on PPFD, the 600 Watts LED light has the same PPFD as a 800 - 1000 Watts HPS light (considering a high-end LED system).
What are the benefits of LED vs. HPS?
■ Yes there definitely are! A recent study conducted by the Wageningen University & Research Centre in the Netherlands shows promising results for LED grow lights. They found that the crops that were grown under high light intensity produced a higher bud weight when compared to the same crops grown under normal light intensity.
■ Furthermore, the study found that in all varieties of light, crops grown using LED produced a higher content of active substances than crops using HPS lamps with the same light intensity.
■ The aroma, flavor, and color of a plant depend on the type, strength, and quantity of Terpenes within that particular plant. A high Blue ratio during the last 3 days of flowering ensures an explosive increase in A high Blue ratio during the last 3 days of flowering ensures an explosive increase in terpenes in spices and herbs (this is called the ''Blue Light Treatment'').

Privacy Policy

This is the Privacy Statement of Crazy LEDs & More, address Molensingel 71 - 6229 PC, Maastricht, The Netherlands. 

Through the website www.ledbypassion.com sensitive private/personal data is processed. Careful handling of personal data is of great importance to us, therefore personal data is processed and stored by us as described below.


In our processing we comply with the requirements of the privacy law. That means, among other things, that we:


1) Clearly state for what purposes we process personal data. We do this via this privacy statement and our cookie statement.

2) Limit our collection of personal data to only the personal data necessary for legitimate purposes;

3) First ask you for permission to process your personal data in cases where your permission is required;

4) Take appropriate security measures to protect your personal data, and

5) Respect your right to provide your personal data for your inspection, to correct or to remove as required.


We are the team responsible for processing the data. In this privacy statement we explain which personal data we collect/use and for what purpose. Our cookie statement is an integral part of this privacy statement. We recommend that you carefully read these statements. This privacy statement was last modified on July 16, 2018.


Use of personal data

When using our website and purchasing products, you leave certain information with us. That may be personal data. We only keep and use the personal data that is entered by you directly, or the data clearly provided for us to process. We will not use the personal data for other purposes, unless you have given permission in advance.


Personal data is collected by us through various channels. For example, you can order products from our website. When ordering products we will ask you to provide some personal information to us to complete the order. You can also create an account on our website to obtain insight into your orders. With an account you have the possibility to add additional data.


Furthermore, the website offers the possibility to ask questions by means of a contact form, where you are asked to enter information to deal with your question. Finally, we may collect information from you through competitions, newsletter notification, workshops and other actions / activities in which you have participated and left your data.

We process the following data from you. The data is collected in the above manner, from participation in competitions, creating an account and filling in a contact form:


First and last name

Sex (male/female)

E-mail address

Address data

Phone numbers

IP address

Payment details

Purchase history

Online click behaviour


The above data is used for the following purposes:


1) Purchasing products via the website and using the functionalities on the website;

2) Handling your order and informing you about progress;

3) To offer personalized product offerings/content on the website after your permission, based on your interests and your purchase history (both online and offline). We will tell you more about this in the section 'profiling';

4) Sending personalized messages, with your permission, based on (among other things) your interests and your purchase history (both online and offline). We will tell you more about this in the section 'profiling';

5) The processing of possible participation in competitions, workshops, promotions and other matters;

6) Answering questions asked via the website, for example;

improving our services, both online and offline. 


Retention periods

The above data will be kept as long as it is necessary to deliver our service to you- for example, as long as you have not deleted your account. If you have bought something without an online account, the maximum storage period is three years after the last purchase. This depends on the product you have purchased and the corresponding warranty period. Sometimes this maximum storage period will be exceeded, but only if we are obliged to do so under the law.



We can send you e-mails if you have given permission for this. An opt-out option is included for every communication along this route.


Provision to third parties

The information you provide will be passed on to third parties if this is necessary for the execution of the agreement and the delivery of the services / products you have requested. Your address details will be passed on to the shipping services that deliver your order or technical partners who provide services to store your data or maintain our website. If these third parties are outside the European Union, we will ensure that they treat your information according to our rules. Furthermore, we will not give the data you provide to other parties if you have not given permission for this, unless this is necessary in the context of the implementation of the agreement that you conclude with us or if this is legally required or permitted.



Cookies are used on this website. Cookies are small information files that can automatically be stored on or read from your device when you visit a website (including a PC, tablet or smartphone). This is done via the web browser on the device. The information that a cookie obtains about your use of the website can be transferred to secure servers of the working website or that of a third party.


Cookies are used on our website to:

a) Ensure functionalities of the website and to protect the website (technical or functional cookies);

b) Analyze the use of the website and, on that basis, improve the website (analytical cookies);

c) To make it possible to share our website via social media (social media cookies).


Technical or functional cookies

The main purpose of cookies is to save you time and effort. For example, if you customize a web page to suit your personal preferences or if you are navigating in a website, cookies will remember the chosen settings and preferences for future use. When you visit the website again later, the previously entered data can be retrieved by the cookies, so that you can easily use the website as you have previously.


Analytical cookies

In addition, these website cookies are used for tracking statistics, so that we can gain insight into the use of our website and the effectiveness of our campaigns. We use the following analytical cookies:

a) Google Analytics


Advertisement cookies

We also use advertising cookies so that we can improve the online advertising offer for you and we can gain insight into our campaign performance. We use the following advertisement cookies: Google Adwords


Social media cookies

To make it possible for you to share our information on this website via the various social media channels we use the following cookies:



Switching cookies on and off

You can choose whether or not to accept cookies. With most browsers, cookies are automatically accepted, but usually you can change the settings of your browser so that cookies are not accepted if desired (view your browser help page for exact instructions). If you choose not to accept cookies, you may not be able to make full use of interactive features of this website or other sites you visit.


Delete cookies

Most cookies have a best-before date. This means that they automatically expire after a certain period of time and no longer register data from your site visit. You can also choose to manually delete the cookies before the expiry date has expired. For more information about this, you can consult the manual of your browser.



We can combine your personal data from different sources for profiling. We do this by linking your personal (offline) data to your other data, such as online orders, purchase history and click behaviour. In addition, we can combine this data with data that we have obtained from external parties, if you have given permission to this party or to us. Based on this, we can personalize our product range so that it matches your interests and purchase history or we can carry out a credit check in cases where we feel it necessary. In this way we can communicate better and more accurately with you and we can carry out various analytics. Of course we will continue to guarantee your privacy at all times and you have the right to indicate that you do not want to be subject to our profiling by withdrawing your previously given permission.



We take appropriate security measures to limit abuse of and unauthorized access to your personal data. This way we ensure that only the necessary persons have access to your data, that access to the data is protected and that our security measures are regularly checked. In addition, when using data transfer, we use the so-called SSL security system (Secure Socket Layer) in connection with encryption. 



Third party websites

This statement does not apply to websites of third parties that are connected to our website by means of links. We can not guarantee that these third parties handle your personal data in a reliable or secure manner. We advise you to read the privacy statement of these websites before using these websites.


Changes to this privacy statement

We reserve the right to make changes to this privacy statement and our cookie statement. Changes will be published on this website. It is advisable to consult this statement regularly so that you are aware of these changes.


Access and change your data

If you have provided us with personal data, you can send us a request to view, change or delete this data. You can submit this request via our contact page or via the contact details below. To prevent abuse we can ask you to adequately identify you. When it comes to access to personal data linked to a cookie, you need to send a copy of the cookie in question. You can find it in the settings of your browser. If the information is not correct, you can ask us to change the data or have it removed.


Authority Personal Data

Of course we would be happy to help you if you have complaints about the processing of your personal data. Under the Privacy Act you also have the right to file a complaint with the Dutch Data Protection Authority against these processing of personal data. You can contact the Dutch Data Protection Authority for this.


Contact details

If you have questions about your privacy and our privacy and cookie statement, you can contact us via:


Telephone number 0031 (0)85 401 8298

E-mail: info@ledbypassion.com