LED grow lights on the other hand are specifically designed for the benefit of plants and thus sometimes appear strange to human eyes. “Right now we are focused on lighting and that is what a lot of my colleagues are doing as well,” he said. A lot less expensive. Blue LED Lights Blue light is a specific light wavelength that is needed by plants for photosynthesis and growth and is ideal for use on seedlings and young plants. In a blind taste test, they found a very noticeable difference in outcome depending on which percentage of blue light was used, and that the 32 percent blue light produced spicier, more aromatic and tasty basil. “For leafy greens, the production time can be cut in half compared to the field crops. Blue light is usually referred to as radiation with wavelengths between 400 and 500 nm. “Seedlings are typically grown economically in greenhouses,” he said. The effect of blue light on plants is directly related to chlorophyll production. Metal Halides/HPS Lights Made specifically for plants, these lights are rich in both red and blue lights. Yes, the initial price of an LED lamp versus an old-fashioned light is higher, but not as much as is often believed because the cost of LED technology has been steadily declining every year. Click here to add your own comments. For example, spinach and radishes’ growth will improve as well as there will be an improvement of the morphological index. Controlled-Environment Lighting Laboratory, https://www.canr.msu.edu/profiles/dr_erik_runkle/cell. LEDs, being monochromatic sources and being available in wide range of pure colors, are the only light sources that can be tailored to give right spectrum & do wonderful things for plant growth. Fortunately, exposure to blue LED grow lights causes plants to increase production of antioxidants that neutralize ROS. LED grow lights come in many shapes and sizes but as the most essential units of LED grow lights LED chips have most of the effect on the quality of the light, i.e. Horticultural LED systems and the spectral science they have made possible have already revealed some amazing effects, including: using light alone to create bigger yields per plant; producing more marketable crops overall; and changing the wavelength of light to change the flavor of foods. “Some white LED grow lights are relatively inexpensive,” he said. We have also germinated seeds of the broccoli and applied LED as a light quality such as blue, green, red, white, yellow and red + blue color lights to their sprouts for 14 hours and kept dark for 10 hours at the temperature of 25℃ (day)/18℃ (night). The bottom line is no matter how efficient LED lights are they’re not perfect, so you have to take this into account when you’re putting together your grow operation. “With leafy greens, growers are more concerned with consumer preferences for flavor and texture, as well as the yield and the biomass of the plants,” he said. OVERWATERING. One of the studies being done by Runkle’s research team is comparing the effects of different light spectrum wavebands to white light LEDs. For the floriculture crops Runkle is studying, the focus is on collecting more details on the benefits of adding far red to the light spectrum. Another area of research Runkle is interested in studying is to determine how light interacts with other environmental parameters, especially temperature. A similar OSRAM LED product is now being marketed as Phytofy. For more: Erik Runkle, Michigan State University, Department of Horticulture, East Lansing, MI 48824; runkleer@msu.edu. Spectra Produced by Different Light Sources and Their Effects on Trees Different light sources have different emission spectra. Your plants need lots of blue light during the seeding … Again if using LED grow lights, then the photosynthetic effect of plants will increase. Compact fluorescent bulbs give more light output (at a smaller size) and are often built into an aquarium hood. Lighting plants through the dark hours outside does not produce as good an effect. We started performing research with them about three years ago, whereas, we’ve been working with indoor lighting of floriculture plugs since 2011. It’s going to be situational. Some spectrums stimulate vegetative growth and others increase the yield in flowers and fruits. By conducting extensive research, NASA determined that LED lights are the best single source lights for growing plants on Earth as well as in space. A short exposure to far infrared light increased the space between nodes when the exposure occurred at the end of an eight-hour light period. “But we also need to consider temperature effects on the growth rate of plants. Most of the LED grow light research that has been done with leafy greens has studied the effects of red and blue light. As suggested by their name, LED grow lights are luminaires utilizing LED chips in a modern and efficient way to produce light for growing plants. Plants grown in light that is too red may seem spindly and long-stemmed. If they’re on, they give off the same fixed spectrum for every plant though they may vary in intensity depending on the replacement timeframe (older lamps mean lower intensity). The most recent work that we have done is to look at both of these wavebands in independent experiments. Standard fluorescent lights supply good light intensity and produce little heat. Growers like Sustainable Local Foods use LED lighting to produce plants year round while keeping costs down. Design your own plant growth chamber like the ones used by NASA. Red light is responsible for making plants flower and produce fruit. That’s why they’re so effective for your grows. “LED lights allow us to grow year round and keep the costs down.”. I’ve seen general fixtures marketed for the lighting of plants. Can You Use Regular LED Lights If you’re looking to grow plants indoors, then you should know that your plants will need a few specific things to grow. An absence or shortage of blue light results in yellowing leaves and plant collapse. Not surprisingly there are a lot more similarities than there are differences.”. Highly sensitive trees should be avoided in areas where high-intensity lighting rich in red and infrared wavelengths is used. Savvy growers, whether operators of a cutting-edge urban indoor farm or a more traditional large rural greenhouse, are always on the lookout for tools to give them the edge over mother nature and the competition. You can combat this problem by looking for horticultural LED lights. The challenge and the reason that we are looking at ornamentals in indoor production is that there is still a lot of seasonal variability. Artificial night time light from sources such as street lamps affects the growth and flowering of plants and even the number of insects that depend on those plants for food, a study … Not only do LEDs save on growers’ electric bills, they reduce other costs as well. … You can combat this problem by looking for horticultural LED lights. It’s estimated that between 30 to 50 percent of solar radiation is blocked by greenhouse structures and glazing before it gets to plants. The growth rate of plants will increase when regular lights can’t do that. “In part, light can be used to manipulate these different attributes. An observation for Florida: I was initially under the assumption that light pollution's effect on the trees and plants would NOT be much of a concern for us in South Florida, mostly because of the fact that it was of the incompatibility of the timing of the lights and the change in the weather from the seasons as Chaney pointed out in his report. In addition to reducing the need for hormones, some studies have shown that LEDs can reduce or eliminate the need for pesticides as well, further benefiting workers who no longer have to be exposed to these toxic substances. Leaf senescence, as the last stage of leaf development, is often regarded as a type of programmed cell death (PCD) (van Doorn and Woltering, 2004).The senescence process is accompanied by degradation of chlorophyll and protein, a decline in photosynthesis, remobilization of nutrients to developing or storage organs and oxidative degradation of lipids (Hameed et al, 2013, …

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