Fake or not? Every edition of Garden Culture Magazine you can test your knowledge and critical reading capabilities. Many pseudo-scientific articles come with scientific references, and mis-use that to prove a point. This edition is about photosynthetic efficiency. Does spectrum really matter that much for photosynthetic efficiency? Or is there another reason why a wide spectrum is better? Cast your vote, fake or not, and discuss. 15th of May we reveal the answer. https://gardenculturemagazine.com/fake-or-not/

So you think you know lighting? Here is a challenge for you: Garden Culture Magazine features a "Fake or not" quiz every issue, starting this month! Test your knowledge and join the discussion. https://gardenculturemagazine.com/fake-or-not/

One of the most frequent questions we get is when to change a reflector. Why do you need to change reflectors regularly? How often should you do this? What's the science behind it? Read it in "Light Matters" episode 9. Published earlier in Garden Culture Magazine, now available for download from our website: http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

Better safe than sorry, especially when it concerns your eyes! Dealing with high intensity lighting on a daily base and the installation of high power lighting requires a good understanding of the dangers involved. It's not only UV you need to be worried about, even blue light can be dangerous. In episode 8 of the editorial series "Light Matters", Theo Tekstra discusses the main dangers of working with high intensity lighting, and the installation and maintenance of them. Earlier published in Garden Culture Magazine and now available for download on our website. http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

"Light Matters" episode 7 - Lighting Control - is available for download. Theo Tekstra discusses what happens to the spectrum and the efficiency of a lamp when you dim it, why you would want to regulate your light and why to do that with a lighting controller. Published earlier in Garden Culture Magazine and now available for download on our website: http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

Ceramic Metal Halide aka CMH aka CDM aka LEC? What does it mean? How does it compare to other lighting technologies? Theo Tekstra explains you the science and the hype in Light Matters episode 6. Earlier published in Garden Culture Magazine and now available for download on our website: http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

Light Matters number 5 is published for download. In this episode Theo Tekstra discusses spectrum, morphogenesis, why many companies interpret the McCree response curve incorrectly and much more. Earlier published in Garden Culture Magazine. Go get your weekly dose of knowledge at http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

Episode 4 in our editorial series "Light Matters" from Garden Culture Magazine is now published on our website. This week, Theo Tekstra discusses the five most common mistakes and misconceptions in lighting. They include reflector placement, air cooled reflectors and the difference between medium wide and deep reflectors. If your buddy still tells you that you have to space your lamps in a 4x4 grid then this is a must-read for your buddy too! Read the article (and all previous articles) on our website http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

Our marketing manager, Theo Tekstra, frequently contributes to magazines and on-line publications. For Garden Culture Magazine he writes a series of articles about light and lighting, published under the title "Light Matters". The first three articles are now published on our website for download. Coming weeks we will add one more every week until all 9 are published. You will also find five articles from issues before Light Matters became a regular feature. This week's episode (LM3) is about space optimization and optimal light positioning. We light rooms, not just plants. Repositioning your lights and adapting your grow space can lead to a much better utilization of your light and can increase your yield by as much as 25%. Why? How? Read the article on our Whitepaper and Publications page. http://www.gavita.com/retail/gavita-lighting-academy/whitepapers-publications#publications

Gavita zoekt een medewerker marketing en communicatie. Ben jij onze nieuwe marketing held? Bekijk de vacature op onze website! http://www.gavita.com/retail/contact/vacature-marketing-1

Measuring the efficiency of HID lamps in a reflector is done with a photogoniometer. How that works, you can see in a previous video we made. In that video we said there was a catch when you measure HID lamps in a reflector. (link to previous video: https://www.facebook.com/Gavitainternational/videos/1096406357064762/) What it comes down to is that all commercial labs measure the light output of a reflector in lumen. What you measure in lumen depends on the spectrum of the lamp: lumen are measured according to the sensitivity of the human eye. PAR light is not measured according to a curve, it's all the photons between 400 and 700 nm in total. An HPS lamp in a reflector, specifically in a more closed reflector, warms up and you will see a slight spectral shift because of that. The difference in lumen output, as this is based on the human eye sensitivity curve, can be dramatic. A warmer lamp can show up to 10% less lumen output, or even more. The PAR output however hardly changes! What does this mean? 1. If you measure efficiency in lumen, a warm lamp can show a much lower efficiency in a reflector 2. All lighting labs around the world use lumen as a standard - it is part of their ANSI/CIE measurement protocols 3. Though lumens output of a lamp in a reflector can change a lot, the PAR output hardly changes 4. Using lumen output to quantify reflector efficiency leads to disinformation if you use it for growing plants 5. In a lumen measurement, an open reflector will perform much better as the lamp does not warm up that much. This is also the reason why you see so many measurements with different results. In most cases they are comparisons from accredited lighting labs, using the wrong methodology for measuring grow light. There is a solution for this issue, which was developed by the Philips lighting labs (the largest manufacturers of HID lamps in the world). Gavita uses this same methodology, and calibrates its photo lab according to Philips standards. In this video I sit down with Freddy Manders from Philips, and we explain how that works, and why so many published efficiency measurements are so incorrect.

Buy a lamp, get a reflector for free!* Change your lamp and reflector frequently. It is the easiest way to get more light on your crop. Experience the difference with the Gavita Replacement Kit. Available now! For more information: kit.gavita.com *This offer is valid while stock lasts.