LED Lights
Posted: Fri Jun 05, 2009 3:21 pm
Do any of you have any experience with LED lighting? A friend of mine is considering buying one.
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No experience, but the word on the street is "don't bother".Dick Hertz wrote:Do any of you have any experience with LED lighting? A friend of mine is considering buying one.
FullySikMate wrote:Sounds like you got trully ripped off with those UFO's Prawn
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If i remember correctly he comes to the conclusion they just aint worth it yet
Didn't get ripped off - we didn't pay for them. It was a trial grow. The shop lent them to us to see if they were any good before he decided to stock them. The verdict was he wouldn't stock them after our results.FullySikMate wrote:Sounds like you got trully ripped off with those UFO's Prawn
Sometimes, ya gotta think out of the box...won't find that on MJ forums. I remember all the tools/trolls on OG...on the fluoro threads. Now the fluoro proponents would have told you, fluro can't provide enough light for decent grows. Yet some do alright, witness the ego sensitive Beekaa mod on OpG who edited my post, simply because I disagreed with him, lol. Well he was wrong, so what if he's got as 'The Joker' said to me in a PM alerting me to the fact that he got email from people who said "who is this blowhard, asshole"...most likely Big-V didn't like my stealing his Mick jagger swagger thunder, in avoiding being arrested. Yeah, so what if the Netherlands has lots of experience with *current* and old antiquated fluro micro cabinet grows that are according to 'The Joker" "awesomely documented" BFD.Dick Hertz wrote:Do any of you have any experience with LED lighting? A friend of mine is considering buying one.
awwh, purdy pix...and the post author says you need 3w or 5w emitters. Well maybe. What you need to understand is them there LED's are current limited/driven devices. Same LED can be driven to 3w or 5w if it was designed for that. And at higher wattages (current flow) efficiency deteriorates unless you can keep them emitters nice an cool (sorry Sportster, LED's do emit some heat, and if not controlled, it's a waste of energy/efficiency)Lumi Grow 260w (250w usable light) 50-5w Luxeon LED, 50w of blue and 200w of red.
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red and blue = purple...duh
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Remember when you read about some new product by a company that's trying to sell it, everything they publish might be misleading . TMod Maverick said as much on OpG,When bombarded with ultraviolet rays from the sun, the lettuce leaf creates UV-absorbing polyphenolic compounds in its outer layer of cells. Some of these compounds are red and belong to the same family that gives color to berries and apple skin. They help block ultraviolet radiation, which can mutate plant DNA and damage the photosynthesis that allows a plant to make its food. Polyphenolic compounds,which include flavonoids like quercetin and cyanidin, are also powerful antioxidants. Diets rich in antioxidants are thought to provide a variety of health benefits to human beings, from improving brain function to slowing the wear and tear of aging.
To create red leaf lettuce plants enriched with these compounds, Britz purchased low-power LEDs that shine with UVB light, a component of natural sunlight. In small quantities, this ultraviolet light allows humans to produce vitamin D, which has been cited for its health benefits. Britz exposed the plants to levels of UVB light comparable to those that a beach goer would feel on a sunny day, approximately 10 milliwatts per square meter. After 43 hours of exposure to UVB light, the growing lettuce plants were noticeably redder than other plants that only saw white light.
http://www.ledsmagazine.com/news/6/5/1Plant growth gets the red light from Showa Denko
07 Apr 2009
The Japanese LED maker has developed high-performance 660 nm chips that accelerate plant photosynthe
Note the package size on these, 1/4th the area of standard high-power LED's now in use in the older MJ forum LED lighting non-solutions :D...can you think of a reason why that might be important?Several announcements from leading LED makers including Cree and Lumileds demonstrate further improvements at the device level.
Cree LED achieves 139 lm at 350 mA
Just before Lightfair, Cree announced the XLamp XP-G LED, described as “the industry's brightest and highest-efficiency Lighting-Class LED” (see press release).
It is important to note that the XP-G is not yet commercially available, however Cree is currently taking sample requests and says products should be available in the third quarter of calendar 2009.
The cool white XLamp XP-G provides 139 lumens and 132 lm/W at 350 mA, and 345 lm at a current of 1 A. Presumably, these figures relate to the highest available bin.
Cree claims that the XP-G LED has “the highest lumen density of any available lighting-class LED.” The product is based on the XLamp XP family package, with dimensions of 3.45 x 3.45 mm. Cree’s XR family package measure 7.0 x 9.0 mm.