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So for me specular light is very much about the “dynamic range” of how the light is reflected on a surface. If the brights are very bright and the darks are very dark, then the light is specular. Remember here that the nature of the light is assessed looking at how it is reflected by the subject.

“One of the most innovative parts of the system is that we can turn on the lighting independently of the heat,” said Kramer. “During the summer, we don’t need the heat, so we just turn on the lights. And when it gets cold in the fall through spring, we can turn on the heat as well. This innovation makes the total unit far more energy efficient than past iterations, hence the sustainability aspect.”

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These lights also allow for maximal customization of the field treatment. While more traditional grow lighting systems emit both light and heat from the bulbs, LED lights put out very little heat.

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Part of implementing the new lights was a focus on the data that will ensure the groundskeeping staff can maximize the effectiveness of the lights based on sunlight, weather and more. Using SGL’s TurfPods, the club can collect data on soil moisture, temperature and salinity in the rootzone and canopy temperature, humidity and light at the surface.

An artificial grow lighting system is essential for stadiums with grass fields. The grow lights help the grass stay healthy throughout the year, even during periods of shorter daylight and cold weather. The grow lights will be an important part of field maintenance throughout the year.

Frederik is a photographer, blogger and youtuber living in Denmark in the Copenhagen region. Outdoor photography is the preference, but Frederik can also be found doing flash photography applied to product shoots and stills. View all posts by Frederik Bøving

“The data we get from the systems can tell us a lot about the conditions of the grass and the local atmospheric conditions,” said Kramer. “More data for us means we have to know how to parse through it all and take the necessary steps to address it. It makes us better at our job because we can offer a better surface for our athletes if the grass gets what it needs.”

If you see tarmac on a sunny day, the tarmac does not reflect very much light (it tends to absorb the light and get warm for that reason), but as soon as you have rain hitting the tarmac, the water on the surface will start reflecting the light and will do so in a way where the incoming light is reflected pretty close to how it arrived. So all of a sudden the reflections of the light in the water is very bright – I am sure you have tried this driving home late at night; the headlights from the oncoming cars is suddenly a nuisance because the rain set in.

I must admit that I keep getting confused about specular light vs diffused light relative to soft light vs hard light. It is especially diffused light and soft light that I mix up, but let me give it a try.

‘The Current’ is a young and ambitious soccer club, dedicated to women’s soccer. It is expected that the state-of-the-art CPKC stadium, which is now under construction, will be ready for use in 2024. The investment in sustainable LED technology to maintain the grass playing surface fits perfectly within the innovative and sustainable character of the facility.

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For years, High-Pressure Sodium (HPS) technology was predominantly used to provide light and warmth to the grass plant for the recovery of the playing field. However, an increasing number of sports facilities are now opting for the ‘new’ energy-efficient variant: LED grow lighting technology. With three LED440 and two LED120 grass grow lighting units, Kansas City Current is the first sports facility in North America to adopt this innovative technology. The KC Current are leading the way in turf maintenance technology in the U.S. and other clubs are following.

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“Our grounds crew is all-in when it comes to taking care of the pitch,” said Jenkins. “The more tools we have, the more work we have to do. But it also fuels a hunger and pride because this is a once in a lifetime project. We greatly appreciate the investment being made by our ownership to being the best women’s football club in the world.”

One of the tests that I often do when reviewing a lens is to shoot a piece of tinfoil curled up into a ball. Such a subject will yield specular light where the brights are very bright and the darks are very dark; excellent for revealing issues with chromatic aberrations, which you will often see where the contrast between bright and dark meet.

“We started this process with an analysis of the stadium design and built a ‘Transmission Analysis’ that shows how light will move across the pitch each month of the year,” explains Matt Williams, Technical Sales Engineer at SGL. “Our agronomy department, in conjunction with the KC Current groundskeeping staff, uses this analysis to determine where and for what duration to use the lights.”

The fans will have to wait a little bit longer before they can cheer their beloved KC Current to victory in the new stadium. One thing is certain, the field won’t be the issue.

“The pink colour the units radiate is the result of the composition of the light spectrum utilized by our LED grass grow lights,” said Williams. “This light spectrum focuses on the wavelengths of light that are most efficient at conducting photosynthesis in the plant (red and blue). This is the most efficient from an electrical and photosynthetic perspective.”

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If you would like to know how our products and services can help you maintain a high-quality and safe playing surface all throughout the year, fill out the form and schedule an appointment with one of our experts.

Diffused light however will have much less contrast between light and dark. It tend to be more “shades of grey” than black and white, to put it simply. The subject appears more evenly lit.

“LED lights are significantly more energy-efficient than traditional sources of light,” added Scott Jenkins, KC Current Vice President of Facility Development. “Grow lights have been around for some time, but not with this new LED technology. We are committed to be leaders in how we operate the stadium, and this is just one of many investments we are making to raise the bar in our industry. We are thrilled to be the first in North America to use this new technology to enhance growing conditions.”

“If you look at grass in predominantly shaded areas, you’ll notice it isn’t very dense and the grass plant is naturally longer,” said head groundskeeper Jackson Kramer. “That’s because the plant is reaching for the sunlight it’s lacking. If you give it enough light for photosynthesis, it doesn’t need to reach as much, so we get a denser, healthier plant. With the canopy over our stadium, it creates shadows over the field and in certain areas, the grass doesn’t get as much sun as it needs. These grow lights provide that supplemental light so the grass can be at its healthiest.”