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LED GUIDE
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://crazy-leds.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: crazy-leds.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://crazy-leds.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'').

Terms & Conditions

Article 1 – Definitions

In these Terms and Conditions, the following terms shall have the following meanings:

1. Reflection period: the period during which the Consumer may use his right of withdrawal;

2. Consumer: the natural person who does not act for purposes related to his/her commercial, trade, craft or professional activities;

3. Day: calendar day;

4. Continuing performance contract: a contract serving to deliver goods, Services and/or digital content in a given period;

5. Sustainable data carrier: any means, including email, that allow the Consumer or the Entrepreneur to store information directed to him/her personally in such a manner that makes future consultation and use possible during a period that matches the purpose for which the information is destined and which makes unaltered reproduction of the stored information possible;

6. Right of withdrawal: the Consumer’s option not to proceed with the distance agreement within the cooling-off period;

7. Entrepreneur: the natural of legal person who provides products, (access to) digital content and or services to Consumers at a distance;

8. Distance contract: a contract concluded by the Entrepreneur and the Consumer within the scope of an organized system for distance selling products, digital content and/or services, whereby exclusive or additional use is made of one or more technologies of distance communication up to the conclusion of the contract;

9. Technology for distance communication: a means to be used for concluding an agreement without the Consumer and the Entrepreneur being together in the same place at the same time.


Article 2 – The Entrepreneur’s identity

Name of Entrepreneur:                Crazy LEDs & More

Business address:                         Molensingel 71, 6229 PC, Maastricht, Netherlands

Telephone number:                     0031854018298

Email address:                              info@crazy-leds.com

Chamber of Commerce number: 69654034

VAT identification number:          NL 857959384 B01


Article 3 – Applicability

1. These General Terms and Conditions apply to any offer from the Entrepreneur and to any distance contract concluded by the Entrepreneur and the Consumer.

2. Before concluding a distance contract, the Entrepreneur shall make the text of these General Terms and Conditions available free of charge and as soon as possible. If this is reasonably impossible, the Entrepreneur shall indicate in what way the General Terms and conditions can be inspected and that they will be sent free of charge if so requested, before the distant contract is concluded.

3. If the distance contract is concluded electronically, the text of these General Terms and Conditions, in deviation from the previous section and before the distance contract is concluded, may also be supplied to the Consumer electronically in such a way that the Consumer can easily store it on a long-term data carrier. If this is reasonably impossible, it will be specified where the General Terms and Conditions can be viewed electronically. At the Customer’s request, the General Terms and Conditions will be sent, free of charge, either via electronic means or otherwise, before concluding the distance contract;

4. In the event that specific product condition apply in addition to these General Terms and Conditions, the second and third paragraphs shall apply accordingly, and in the event of contradictory terms and conditions, the Consumer may always appeal to the applicable provision that is most favorable to him/her.


Article 4 – The offer

1. If an offer is of limited duration or if certain conditions apply, it shall be explicitly stated in the offer.

2. The offer contains a full and accurate description of the products offered. The description is suitably detailed to enable the Consumer to assess the products adequately. If the Entrepreneur makes use of pictures, they are truthful images of the products provided. Obvious errors or mistakes in the offer do not bind the Entrepreneur.

3. All offers contain such information that it is clear to the Consumer what rights and obligations are attached to accepting the offer. This concerns in particular:

a. price inclusive taxes

b. possible costs of delivery

c. the manner in which the agreement has been concluded and the necessary signatures

d. whether to apply the right of withdrawal

e. the method of payment, delivery and performance of the contract

f. the deadline for accepting the offer or the period within which the entrepreneur guarantees the price

g. the level of the rate for distance communication if the costs for the usage of the technology for distance communication are calculated on another ground than the regular fare for communication

h. if the agreement after the conclusion is archived and if so, how to consult it for the consumer

i. the consumers options, before concluding the agreement, check and if necessary also restore the information provided by hem under the agreement

j. any other languages, including Dutch, for the agreement

k. the codes of conduct to which the entrepreneur is subject and the manner in which the consumer can consult electronically the codes of conduct; and

l. The minimum duration of the distance agreement in the event of a length transaction.



Article 5 – the Contract
1. Subject to the provisions in paragraph 4, the contract becomes valid when the Consumer has accepted the offer and fulfilled the terms and conditions set.

2. If the Consumer accepted the offer via electronic means, the Entrepreneur shall promptly confirm receipt of having accepted the offer via electronic means. As long as the receipt of said acceptance has not been confirmed, the Consumer may repudiate the contract.

3. If the contract is concluded electronically, the Entrepreneur will take appropriate technical and organizational security measures for the electronic data transfer and ensure a safe web environment. If the Consumer can pay electronically, the Entrepreneur shall observe appropriate security measures.

4. The Entrepreneur may, within the limits of the law, gather information about Consumer’s ability to fulfil his payment obligations, and all facts and factors relevant to responsibly concluding the distance contract. If, acting on the results of this investigation, the Entrepreneur has sound reasons for not concluding the contract, he is lawfully entitled to refuse an order or request supported by reasons, or to attach special terms to the implementation.

5. Before delivering the product, the Entrepreneur shall send the following information along with the product, the service or the digital content in writing or in such manner that the Consumer can store it in an accessible manner on a longterm data carrier:

a. the visiting address of the Entrepreneur´s business establishment where the Consumer may get into contact with any complaints;

b. the conditions on which and the manner in which the Consumer may exercise the right of withdrawal, or, as the case may be, clear information about his being exempted from the right of withdrawal;

c. the information corresponding to existing after-sales services and guarantees;

d. the price including all taxes of the product, service or digital content, where applicable the delivery costs and the way of payment, delivery or implementation of the distance contract;

e. the requirements for cancelling the contract, if the contract has a duration of more than one year, or an indefinite period of time.

6. In case of a continuing performance contract, the stipulation in the previous paragraph only applies to the first delivery.


Article 6 – Right of withdrawal

1. The Consumer can repudiate a purchase contract for a product without giving reasons for a period of reflection of 14 days. The reflection period starts on the day the product is received by the Consumer or by a third person appointed by him in advance and who is not the carrier.

2. During this period the consumer shall treat the product and the package carefully. He shall unpack or use the product only to that extent to as far as it is necessary to judge if he wishes to keep the product. If he does want to execute the right of withdrawal, he shall return the product with all accessories and -if reasonably possible- in the original conditioning and packaging to the entrepreneur, in accordance with the provided reasonable and clear instructions of the entrepreneur.

3. In order to execute the right of withdrawal, the consumer must abide by the reasonable and clear instructions provided by the entrepreneur at the offer or finally at the deliverance of the service.


Article 7 – Exercising the Consumer’s right of withdrawal and the costs

1. If the consumer executes the right of withdrawal, he will have to pay no more than the costs of returning the product.

2. If the consumer has made a payment, the entrepreneur shall pay back this amount as soon as possible but no later than within 14 days after the repeal or after the return shipment.


Article 8 - Exclusion of the right of withdrawal

1. The entrepreneur can exclude the right of withdrawal of the consumer for as far as foreseen in paragraph 2 and 3. The exclusion of the right of withdrawal applies only if the entrepreneur has clearly mentioned this at least in time before the conclusion of the agreement.

2. Exclusion of the right of withdrawal is only possible for the following products:

a. Which are established by the entrepreneur according to specifications of the consumer;

b. That they are clearly personal in nature;

c. Which cannot be returned because of their nature;

d. That can spoil or age quickly;

e. Whose price is bound to fluctuation on the financial market which the entrepreneur has no influence on.

Article 9 - The price

1. The prices of the products provided shall not be raised during the validity period given in the offer, subject to changes in price due to changes in VAT rates.

2. Contrary to the previous paragraph, the Entrepreneur may offer products whose prices are subject to fluctuations in the financial market that are beyond the Entrepreneur’s control, at variable prices. The offer will state the possibility of being subject to fluctuations and the fact that any indicated prices are target prices.

3. Price increases within 3 months after concluding the contract are permitted only if they are the result of new legislation.

4. Price increases from 3 months after concluding the contract are permitted only if the Entrepreneur has stipulated it and:

a. they are the result of legal regulations or stipulations, or

b. the Consumer has the authority to cancel the contract before the day on
which the price increase starts.

5. All prices indicated in the provision of products or services are including VAT.


Article 10 – Performance of an agreement and extra Guarantee

1. The Entrepreneur guarantees that the products comply with the contract, with the specifications listed in the offer, with reasonable requirements of usability and/or reliability and with the existing statutory provisions and/or government regulations on the day the contract was concluded. If agreed, the Entrepreneur also guarantees that the product is suitable for other than normal use.

2. An extra guarantee offered by the Entrepreneur, his Supplier, Manufacturer or Importer shall never affect the rights and claims the Consumer may exercise against the Entrepreneur about a failure in the fulfilment of the Entrepreneur’s obligations if the Entrepreneur has failed in the fulfilment of his part of the agreement.


Article 11 – Delivery and execution

1. The Entrepreneur shall exercise the best possible care when booking orders and executing product orders and when assessing requests for the provision of services.

2. The place of delivery is at the address given by the Consumer to the Entrepreneur.

3. With due observance of the stipulations in Article 4 of these General Terms and Conditions, the Entrepreneur shall execute accepted orders with convenient speed but at least within 30 days, unless another delivery period was agreed on. If the delivery has been delayed, or if an order cannot be filled or can be filled only partially, the Consumer shall be informed about this within one month after ordering. In such cases, the Consumer is entitled to repudiate the contract free of charge and with the right to possible compensation. This compensation will never exceed the amount stipulated in the agreement.

4. After repudiation in conformity with the preceding paragraph, the Entrepreneur shall return the payment made by the Consumer promptly but at least within 30 days after repudiation.

5. If the delivery of an ordered product appears to be impossible, the entrepreneur shall strive to make available a replacement product. At least before the delivery it will be mentioned in a clear and understandable manner that a replacement product will be delivered. The right of withdrawal cannot be ruled out with regard to replacement products. The costs of a possible return shipment come at the expense of the entrepreneur.

6. The risk of loss and/or damage to products will be borne by the Entrepreneur until the time of delivery to the Consumer or a representative appointed in advance and made known to the Consumer, unless explicitly agreed otherwise.


Article 12 – Continuing performance agreements: duration, termination and renewal

1. The Consumer may at all times terminate a contract that was concluded for an indefinite time and which extends to the regular delivery of products, with due observance of the termination rules and subject to not more than one month’s notice.

2. An agreement which has been entered for a definite time, has a maximum duration of 2 years, and which extends to a regular delivery of products, may only be automatically extended for an indefinite period if the consumer at any time terminate with a notice period of no more than one month.


Article-13 Payments

1. Unless otherwise agreed, the amounts due have to be met by the consumer within 7 days after entering the cooling off period referred to article 6, paragraph 1.
2. The consumer has the duty to immediately notify the entrepreneur about inaccuracies in the payment details.
3. In case of default by the consumer the entrepreneur has, subject to legal restrictions, the right to charge the reasonable costs which are made known to the consumer in advance.


Article 14- Complaints

1. The entrepreneur features a sufficiently publicized complaints procedure and handles the complaint according to this complaints procedure.
2. Complaints about the execution of the agreement must be, fully and clearly described, submitted to the entrepreneur within 7 days after the consumer has observed the defects.
3. The complaints submitted to the entrepreneur will be answered within a period of 14 days from the day of receipt. If a complaint has a foreseeable longer processing time, the entrepreneur will answer within 14 days an acknowledgement and an indication when the consumer will receive a more detailed answer.
4. If a complaint cannot be resolved by mutual agreement then there is a dispute that is subject to the dispute settlement.
5. In case of disputes the consumer can approach Stichting WebwinkelKeur (WebwinkelKeur Foundation) and this foundation will mediate for free. If both parties cannot come up to a solution then the consumer has the possibility to let his complaint be handled by Stichting GeschilOnline. (GeschilOnline.nl Foundation) The ruling of this foundation is binding and both the consumer and the entrepreneur accept this binding ruling.
6. A complaint does not suspend the obligations of the entrepreneur, unless he specifies otherwise in his general conditions/terms.
7. If a complaint is accepted by the entrepreneur, the entrepreneur at its option replaces the products or repairs them free of charge.


Article 15- Disputes

1. Dutch law exclusively applies to agreements between entrepreneur and consumer whereupon these general conditions/terms are related to.

2. The CISG does not apply.