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When you grow in a greenhouse environment, you absolutely want to reduce the shade impact of the grow lights on you crops. In that case the CoolStack® gives a perfect fit to the needs. With a shade impact coefficient of just 100mm² per μmol this LED top light offers the lowest overall shading in greenhouse cultivation. With the optical lenses you can adapt the beam angle to your practical growth room and required PPFD.

When you let us know your dimensions of the growth room, we will provide you with the optical simulation to get your lights right. For personalized advise on your projects we recommend you to get in contact us. Our expertise of over 20 years in lighting brings major technology driven advantages to the world of professional growers. This website uses cookies to offer you the best online experience. We respect your privacy and do not collect any personal data without your permission. More information can be found in our privacy policy. A cookie is a small text file that is stored on your computer, tablet or smartphone when you visit our website. This text file contains information about your preferences, such as language settings, which will be recognised by this website during your next visit.

The technical cookies on this website allow you to add products to your shopping basket and pay them at a later time, for example. We use a web analysis program named 'Google Analytics', which allows us to optimise the website for your convenience based on anonymous website use data, without consulting any personally identifiable data. We do not collect any of your personal data by means of tracking cookies, data combination or profiling. Social media cookies: we do not place these cookies Remarketing cookies: we do not place these cookies. The Ultimate Lighting Guide for Cannabis Cultivation. A Science-Based Guide for Understanding Grow Light Terminology and Lighting Options. When growers do not have the option of growing cannabis outside, they will have to decide on the best cannabis grow lighting for indoor growing. Growers have a challenging task when deciding what grow light to use for cannabis indoors. Grow lights can also be needed for growing cannabis in greenhouses. Greenhouse grow lights for cannabis will have very different functions than grow lights for indoor cannabis cultivation. Aside from picking the right type of light, there is an abundance of grow light terminology that can be confusing. Understanding grow light terminology is essential for creating the best indoor cannabis grow. Cannabis sativa is a short day plant that possesses great medicinal qualities. Short day plants change from the vegetative growth stage to the floral growth stage when they are exposed to critical short day lengths. For cannabis this is 12 hours of light to trigger flowering. Most growers will keep cannabis is 16 to 18 hours of light during the vegetative growth stage. Another way to reduce energy use during the vegetative growth stage of cannabis is to use a gas lantern routine. The gas lantern routine runs lights on a schedule where they are on for 12 hours, off for 5.5 hours, on for one hour, then off for 5.5 hours again. This cycle repeats and maintains vegetative growth by tricking the plant with the one hour of lighting between off periods. Instead of using 16 or more hours of light, only a total of 13 hours is used with the gas lantern routine. Cannabis grown outdoors will move through growth stage changes as conditions naturally change. When grown in a greenhouse or grow room, growers can take advantage of this trait, called photoperiodism, to shorten or extend cropping time. Lighting specifically for inducing growth stage responses in day length sensitive plants is referred to as photoperiod lighting.

Photoperiod neutral plants are not sensitive to day length and will flower based on other cues. Autoflowering cannabis plants flower based on the plant’s age. These unique cannabis plants have this adaptation because they are native to areas near the equator that do not experience short days soon enough in the natural growing season, and to areas like Siberia where day lengths can be shorter than 12 hours before the plant has reached sufficient vegetative growth to move on to flowering. Daylight Extension Lighting vs Supplemental Lighting. Long day plants like spinach and lettuce also exist. These plants need a critical long day length to initiate flowering.

Greenhouse growers may need daylight extension lighting to flower long day plants or keep short day plants from flowering. Greenhouse growers of short day plants will also need to use blackout systems to ensure successful flowering of short day plants like cannabis. Supplemental lighting is a different type of lighting that can help support greenhouse plants when days are very overcast and there is not sufficient natural light. Photosynthesis is an important metabolic process in plant growth. More than 90% of the dry matter of a plant is created from photosynthetic conversion of atmospheric carbon dioxide (CO2).


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