Netherlands’ Wageningen UR Greenhouse Horticulture Study shows using diffuse light results in 25 percent growth rate increase

February 12, 2014

Diffuse Light Results In 25 Percent Growth Rate Increase, Wageningen UR Study Shows

Anthurium plants produced in light-diffused greenhouses equipped with Svensson’s Harmony screens were ready for sale at 16 weeks compared to the normal 22 weeks.

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December 30, 2013

MSU Researches Growing Seedlings Under LEDs

In part one of a two-part series, Michigan State University researchers share their findings in germinating seedlings with LED lights.

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October 7, 2013

LEDs Could Eventually Manipulate Scent, Color In Ornamentals And Edibles

With the ability to deliver specific light wavelengths with LED lights, growers, retailers and consumers could eventually manipulate the scent, color, flavor, postharvest life and other characteristics of ornamental and edible crops.

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September 17, 2013

LEDs Reduce Costs For Greenhouse Tomato Growers According To Purdue Study

Tomatoes grown around LED lights in the winter can significantly reduce greenhouse energy costs without sacrificing yield, according to a Purdue University study. Cary Mitchell, a professor of horticulture, said the average tomato is shipped about 1,500 miles from warmer climates where they’re grown to cooler climates that cannot produce the fruit cost-effectively in the winter. That journey is costly, however, because tomatoes are picked green and ripen during shipping, decreasing quality and flavor. The lengthy shipping distance also adds to the industry’s carbon footprint. “It makes it really hard for the greenhouse industry to grow tomatoes well in the offseason. We’re trying to change that and make it affordable,” Mitchell said. Energy costs drive up prices for producers who might want to grow tomatoes in greenhouses in states that have winters inhospitable to growing food. Greenhouses must be heated, and shorter, overcast days require costly lighting. Mitchell and doctoral […]

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September 13, 2013

Propagation With LED Lighting

Integrated Botanics, a young plant producer serving Seville Farms, is making use of versatile LED lighting options in its new germination room to improve propagation.

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September 13, 2013

Comparing LED Lighting To High-Pressure Sodium Lamps

Cuttings of vegetatively propagated bedding plants are frequently rooted in late winter and early spring to meet the spring and early summer market demand for flowering bedding plants. However, this is also the time when dirty and old glazing material, interior superstructures, and hanging baskets suspended above benches reduce already seasonally low ambient outdoor daily light integrals (DLIs) inside the greenhouse. Increasing the DLI during propagation has been shown to improve growth and quality of rooted cuttings, as well as reduce time to flower after transplanting. While maintaining clean glazing material, minimizing superstructure and reducing the density of hanging baskets may increase greenhouse DLI, the only way to appreciably increase DLI is to provide supplemental or photosynthetic lighting. Light-emitting diodes (LEDs) are solid-state, semi-conducting diodes that can emit light from ~250 nm to ≥1000 nm. There are several features of LEDs that make them attractive alternatives to high-pressure sodium (HPS) […]

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April 22, 2013

Diffuse Lighting Offers Multiple Benefits

Growers are increasingly learning that steering the greenhouse climate, which includes the related factors of light levels, temperature and humidity, can yield big gains in terms of plant quality and productivity as well as economic efficiency in heating and cooling expenses. Researchers, meanwhile, have been demonstrating that diffuse light plays an important role in achieving those goals. Materials have been developed to diffuse direct solar radiation, and use of diffuse light begins with an understanding of light and its behavior. Solar RadiationSolar radiation passes through the top of the atmosphere essentially unchanged by its passage through space. As it moves, it interacts with gas molecules, water droplets and aerosols and is gradually absorbed into the atmosphere. Radiant energy is converted into internal energy. It ceases to exist as radiant energy and heats the atmosphere directly. Very little of this absorption happens in visible wavelengths. Rather, ozone absorbs most of the […]

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April 19, 2013

DLICALC Online Tool Helps Growers Caculate Daily Light Integral

Managing all the different environmental and cultural aspects of greenhouse crop production can be an intimidating and daunting task, especially during the peak production season. But it’s necessary to produce a high-quality, salable plant. The greenhouse is full of moving targets, from root zone pH and EC to plant growth, air temperature and light. Managing each of the parameters of greenhouse crop production to consistently produce quality crops on time can be a challenge. Thankfully, the development of decision-support tools can aid greenhouse growers. GROCALC is a suite of electronic grower decision support tools that include ALKCALC, FERTCALC and PGRCALC. These programs are useful for making calculations related to greenhouse crop culture including water acidification requirements, fertilizer solution and plant growth regulator (PGR) mixing. However, there are few or no tools available to help make calculations related to the greenhouse light environment. Although light is frequently discussed in terms of […]

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October 30, 2012

Ruibal’s Plants Uses Supplemental Lighting To Speed Flowering

When the weather gets warm, nearly everyone is itching to get outdoors. When the weather gets warm weeks earlier than normal, consumers and landscapers start their spring activities earlier, too, and that means they want their plants sooner. The weather this spring really was unseasonably warm. The National Climatic Data Center (NCDC) reports that the United States experienced the warmest spring ever. The NCDC monthly climate report for May indicated that “with the warmest March, third warmest April and second warmest May,” 2012 had the warmest spring on record and the warmest year to date. The NCDC also indicated that this spring’s nationally averaged temperature of 57.1°F was 5.2°F above the long-term average. These balmy temperatures inspired consumers to begin planting flowers. Unfortunately for eager gardeners and garden center owners, growers were not prepared to handle the early demand for spring color. Customers Want Color Early Matt Ruibal, vice president […]

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October 5, 2012

New Plasma Lighting Technology Grows Nutritious Vegetables

Chameleon Grow Systems announced the release of its commercial Solar Genesisplasma horticulture lighting, which third-party research shows produces better veggies than traditional greenhouse lighting. “We have been testing this light source for the past three years, and the full-spectrum nutritional light-energy produced by plasma lighting has produced excellent results,” says Chris Pieser, founder and president. “What differentiates us from the other manufacturers of plasma lighting is our proprietary reflector design, camera quality glass and the optical glass coating incorporated into our products.” Plasma lighting technology is in a constant state of development. By the end of the year, the light output will double, making it better suited to take on the massive job of lighting greenhouses. “We are focused on third-party scientific research to validate this technology and will not recommend our product until we are certain that plasma lighting is the right fit for the grower’s application,” Pieser says. […]

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September 28, 2012

LumiGrow Pro Series Horticultural Lights

Lowering costs and providing the correct levels of light to crops are necessary concerns for any grower. A new LED lighting solution that addresses both of these concerns is now on the market. By teaming up with LumiGrow, Inc., a leader in smart horticultural lighting, Growers Supply now offers innovative LED grow lights for greenhouses and controlled environment agriculture. With the LumiGrow Pro 325 and 650 Horticultural Lights, growers will reduce energy costs by up to 70 percent and boost yields by providing the exact light levels and spectra that plants need. “With the LumiGrow Pro series, growers no longer need to choose between boosting yields and controlling operating costs,” says LumiGrow CEO Kevin Wells. “The LumiGrow Pro series delivers the best of both worlds: tremendous power and energy efficiency unrivaled by any other light.” LumiGrow Pro series lights have a 50,000 hour rating without degradation, lasting up to 10 […]

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