Prompt

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  1. hello mobile, what plants you put in the light philips? I could not find the graphic spectrograph for your lamp. You have the characteristics of the emission spectrum? 730nm is in fact equivalent to the FAR RED, better still 735nm, that corresponds to the maximum absorption peak of the phitocromo. Prompt
  2. Hello Vincent, are in tune with your reasoning. Considers that the warm white LED, used in my custom ceiling, covers by only three lengths for your lamp Red: 630, 660nm, 730nm. That said, I'm happy with my ceiling, currently below are Nepenthes Highland, some sundew, and seedling of N. Ampullaria born in September, for the moment everything is going as it should. I just had to adjust the brightness down, I was left with 11,000 lux to 9000 lux now. With the latest control my ceiling light consumes only 68Watt ! In addition emits white light that does not hurt the eyes, and has no noisy fans :) In future I experimentation by adding LED 730nm, reading many experiments would seem that they have a great effectiveness if used in combination with the other wavelengths. It seems that the phytochrome has an importance in plants that should not be underestimated. View artcle: http://www.hort.vt.edu/ghvegetables/documents/GH%20Lighting/High-Powered_LED_Cultivation_Study_2005.pdf Prompt
  3. The plants are very adaptable, some plants that live in the highlands of the tepui grow in soils almost exclusively of quartz, other species in the wild they grow in sand. Surely the water level should be high especially in areas where the summer is very hot.
  4. Hello, this topic is very interesting, I had tried to grow a small Nepenthes pervilleii in a mix of granite , Brazilian quartzite and vermiculite, the results were encouraging until a worm has eaten the whole plant Now, I'm experimenting with 2 highland Nepenthes a very mineral substrate, composed of 70% Kanuma and 30% peat.
  5. This article describes how to couple the IR (far-red) to a white light. As you can see we still have to find out a lot in the plant world, and more! http://ag.arizona.ed...se Lighting.pdf Karl had already mentioned these wavelengths. These LEDs will be my next investigation. Prompt
  6. Yes what you say is right and it is known to all, unfortunately I can not explain. My reference was not to light commercial, however you should always see if their characteristics correspond to the truth. I wanted to raise the point, especially on home-made lamps. If the LEDs are driven outside of the typical characteristics, the values may vary, ​​including the wavelength , for example an LED declared at 630nm at 300ma, if supplied at 700ma the wavelength may vary 640nm and exit out of the peak of Clorophilla. Prompt
  7. Hello Dicon, With regard to the lumen in fact you're right, you can not use the lumens for plants. As regards the efficiency meant that overall, in the white LED wavelengths are varied and summing these lengths theoretically the efficiency as well for plants, increases.Suming the wavelengths is not a benefit surely?as it is firstly a dilution of the best or desired wavelength that is being added back together, (sounds ok) but as the "off target" wavelengths are of Zero use to the chlorophyll they lose any benefit and cannot be added back so are a drop in efficiency. The plants grow quite well even if they do not receive the peaks of chlorophyll, the fact is demonstrated by those who cultivate with MH and HPS lamps, the majority of these specialized lamps, have peaks on the yellow-orange and yet at the time are the most spread in the workplace. The tubular fluorescent lamps and cfl, are efficient only on the blue band of red is close to zero and the highest peak is green. I think this means that plants have receptors that convert many other colors outside of the peak of chlorophyll. In monochromatic LEDs but also in white is used for testing a specific costant current, it is evident that the variation of the current may lead to a shift of the emission peak. I also remember that more power equals more power dissipated into heat.As each emitter requires a different voltage, running at constant current is essential, this means that in a properly constructed lamp, th use of say 100 x 3watt chips run correctly (to ensure long life) consumes somewhat les than 300watts. I do not know if you've had time to read the interesting test lik: http://streetlightin...PIE6337-17.pdf. Previously not think I explained myself. I state that I'm talking about self-made lamps, what I meant is that the manufacturers of LEDs, indicate a peak at a certain current, the link shows that the peak can be postponed according to the input current, this means that if an LED 350ma to have a peak at 660 nm, feeding it to 700ma peak could slip up to 10 nm. Then a led grow from 660 to 670nm can pass going well beyond the peak of the Clorophilla. Also in the link, it shows how the white LED is the most efficient LEDs with PWM current, and still is more efficient in the red with no constant current pwm. Not use a lux meter but a spectrum analyzer. Prompt
  8. Hello Many say that the lamps with LED blue and red are the best, ask them if they can explain why supporters larger homes lighting are integrating other colors including white, which is the color that seems to not work for you? It seems to me that the theory is only partly true, as is often the case there is no better or worse, because our knowledge is not complete. the my thirst for knowledge is infinite :) Prompt
  9. As an observer and not by scientist, I see that many times our theoretical discourses remain. In nature, plants have adapted to different types of light, full sun, shade, or mixed light, which is why my argument is based on giving the plant the largest range of shades possible. As mentioned by Karl still do not know for sure all about the life of plants, and a spectrum of light designed not necessarily be better than another. The white LEDs as well as the plants grow very well (this is not theory, but practical), are also visually more natural to the human eye. Many of the fluorescent lamp we use 6500k or 4000k are not specialized in the peaks of chlorophyll but the plants grow well, even in a scentiphic test on the germination of seeds of Nepenthes is referred to as the yellow light is the one that did germinate seeds . while blue light germination was low. http://www.tuengr.com/V02/083-091.pdf Prompt
  10. Hello Karl, congratulations! You gave a great presentation on the science of the LEDs. I just wanted to add to your argument that the temperatures are lowered more and more electrons travel better in the conductors, thus theoretically a led led to low temperatures is more efficient and therefore the peak of the wavelength remains fairly constant. As if the LED warms the shift of the peak is more evident. With regard to the lumen in fact you're right, you can not use the lumens for plants. As regards the efficiency meant that overall, in the white LED wavelengths are varied and summing these lengths theoretically the efficiency as well for plants, increases. In monochromatic LEDs but also in white is used for testing a specific costant current, it is evident that the variation of the current may lead to a shift of the emission peak. I also remember that more power equals more power dissipated into heat. view: http://streetlightingresearch.org/programs/solidstate/pdf/Gu-SPIE6337-17.pdf I wanted to thank you for sharing your knowledge Prompt