Earth Friendly Products

Written by Aaron Pratt

Continued from page 1
The lake is clean andrepparttar air smells fresh because this entire community adoptedrepparttar 136264 many earth friendly products that aid in environmental renewal. The people here didn’t do it because of government intervention either; these people embraced new environmental technologies because they are cool! Instead of competing withrepparttar 136265 neighbors by purchasing large SUVs these consumers are buying popular efficient cars that run onrepparttar 136266 many new alternative fuels available.

Can you imagine a world like this where consumers buy earth friendly products because they are popular? Who says things like solar panels, rainwater harvesting, sustainable development, offrepparttar 136267 grid living and other earth friendly products and technologies are not cool?

Aaron Pratt is an inventor, craftsman and blogger. You can read more of his personal, down to earth writings on Aaron's Home and Garden (A Home and Garden Blog)

Growing Plants with LED's

Written by Mihaela Lica

Continued from page 1

SSL (solid state lighting) isrepparttar youngest lighting technology and by now is believed to be more efficient than incandescence and fluorescence due torepparttar 136066 fact that SSLs produce light at or nearrepparttar 136067 visible part ofrepparttar 136068 spectrum and as a resultrepparttar 136069 emitted light can be used straight or with minor conversion. One ofrepparttar 136070 most important advantages is that SSL technology has eliminated damaging components fromrepparttar 136071 light sources (remember: light emitting diodes contain no ultraviolet unless they are produced as UV LEDs).

NASA is already using SSL in its space farming systems. The reasons are quite simple: incandescent or fluorescent lamps are not efficient enough for such purposes, because they consume a lot of electrical power, generate heat and contain electrodes that burn out (maintenance costs are high). This is why NASA’s plant physiologists started to work with light emitting diodes (blue and red) to grow salad plants such as lettuce and radishes. The researchers found our that blue and red light is essential for plant growth and, in general, a percentage of 8% blue LEDs and 92% red LEDs, both withrepparttar 136072 same frequency and relative intensity per LED, are enough for a harmonious evolution. Blue has a smaller influence than red; however a percentage between 1% and 20% of blue light can be selected, depending onrepparttar 136073 plants and their growth requirements. The NASA scientists have tried to createrepparttar 136074 most cost and energy efficient light sources possible, and this is why they have eliminated fromrepparttar 136075 fixtures other colours normally found in white light. "What we've found basically is that we are able to limitrepparttar 136076 amount of colour we give torepparttar 136077 plants and still have them grow as well as with white light." saidrepparttar 136078 research scientist Greg Goins of Dynamac Corp. LEDs are notrepparttar 136079 only ones efficient for growing plants: sulphur microwave lamps arerepparttar 136080 most efficient light sources known to man, that can generate as much light asrepparttar 136081 noonday sun, perfect for illuminating large-scale systems such as greenhouses. For smaller applications, such as indoor gardens, LEDs seem to berepparttar 136082 right choice.

Pros and Contras LED Grow Light Systems

There are some pro and contras when it comes to LED grow light systems. When planning such farming alternatives, one has to carefully consider that plants do use light at all wavelengths from UV to IR, as explained above, needed to convert water and carbon dioxide into sugars. Some plants use more red and blue, less green and yellow, while others use green as much as they use red and blue, as well asrepparttar 136083 light in between. If LEDs are chosen for brightness, there is one aspect to be underlined: they just look bright because their light is unidirectional and their size is small. To get enough light there are many LEDs needed, that’s whyrepparttar 136084 cost of LED arrays or LED modules is so high. LEDs can be calibrated to emit onlyrepparttar 136085 light most efficient forrepparttar 136086 plants, but not allrepparttar 136087 light plants need. This is why such light sources are recommended only in places where direct light fromrepparttar 136088 sun is not enough or inexistent – space farming for example. Also in places where light fromrepparttar 136089 sun is too strong and can harmrepparttar 136090 plants withrepparttar 136091 high emission of UV, LEDs are a good choice, because UV filters are stopping some ofrepparttar 136092 useful wavelengths too. In wintertimerepparttar 136093 weather conditions restrain crop production; this is why greenhouses need a substitute forrepparttar 136094 natural light. It makes sense to deliver plantsrepparttar 136095 minimum lighting conditions for a corresponding evolution.

There are some significant factors to take into account when choosing light sources for such applications and these are low costs, energy efficiency, long life, and ability to withstand voltage fluctuations, modularity in order to grant usersrepparttar 136096 possibility to assemble arrays that gives as much light as needed, where needed. LEDs are pretty efficient inrepparttar 136097 conversion of electric power to light, in any case more than traditional fluorescent and incandescent lamps. Due torepparttar 136098 fact that light emitting diodes can be manufactured to emit a specific wavelength and are expected to have a long life span (from 50000 hours up), many plant physiologists are considering using them in large applications. Compared to LEDs most ofrepparttar 136099 other traditional lamps have to be replaced every two-three years. Other features such as choice of viewing angles, control options, instant turn on times, cold start and much more, recommendrepparttar 136100 semiconductor devices. At present this is still an expensive technology, but in time LEDs efficiency will be maximized while prices reduced and these details are a good base for future planning.

My-tronic GmbH to Produce LED Grow Light Systems on Request

It is so far clear that in order to produce efficient LED grow light systems a lot of investigation is necessary. It is not enough to mount some blue and red LEDs on a PCB and say: “that’s it; we’ve gotrepparttar 136101 plant growing LED system”. NASA created only a mechanism that deliversrepparttar 136102 minimum amount of light needed for some plants. For greenhouses on Earth other questions need to be answered: how much blue, how much red? What aboutrepparttar 136103 other colours, what about UV and IR? Shouldrepparttar 136104 light pulse? Should it be dimmed inrepparttar 136105 morning and evening to imitate natural conditions (sunrise and sunset?). Do plants need light at night? Andrepparttar 136106 list remains opened.

At my-tronic GmbH there are no plant physiologists, but only engineers ready to bring their technical expertise to scientists in order to buildrepparttar 136107 best light sources for LED plant growth systems. The domain is still new and can be considered a challenge for any researcher. Still my-tronic’s engineers know exactly which arerepparttar 136108 LEDs’ limitations, what can be done with such devices and what not. Andrepparttar 136109 company’s motto: “bringing light in your lives” is also a statement of commitment to life and development.

Mihaela Lica started her career as a reporter for the National Romanian Radio Station, worked as a PR Referent in a bank, later used to work as a military journalist for the Romanian MoD and now she is the PR and Media Manager for the German company my-tronic GmbH.

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