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11-20-2008, 02:03 PM #11Senior Member
Building LED lights from facts, no theories
Originally Posted by knna
As for using the cooltube, it was just a matter of necessity....to protect the LED PCBs and T5s from dripping nutrient and water. Plus it is easier to clean a glass 6" tube then 8 individual T5 tubes not to mention the 8- 20" metal PCBs. I clean the glass at least once a day!
It sounds sexy to say I grow in a rotating garden, but it is the most labor intensive system invented by man so far, and it is not a "clean" operation. Only thing worst I can think of is being a dirt farmer. BUT it has had one advantage... more then twice the growing output with the same amount of light input.
The question I have for you kanna is can you quantify light output in terms of micromoles of photon energy for T5s? I have to admit I didn't know a micromole from a gopher until I read some scientific papers posted by physicnole; but it seemed to make the most sence when talking about plant growth. I saw you mention that a 250HPS had about 100 micromoles, that would put SmartLamp at 310 claim well within a possible 600w HPS.
I like how the SmartLamp preforms; in a grape vine propagation experiment, it covers and grows equal to a 600HPS, but with a high light level loving plant like MJ..."a photon whore" (I love that) it suffers what most "brick design" hi power LEDs suffer from, coverage area. Bring the light close enough to take advantage of its higher output, (and you can because there is no heat) and the area covered is just too small. Raise the light to get a wider footprint and suffer with not enough "umph" for those photon whores.
I just happened to luck into my first T5/LED hy-bred light. Its results and what I'm hearing from others, seem to confirm that currently it's the way to go. When I first started with LEDs, I was comming from the "I'm going to save at least 50% of my electric bill". I even got hung up with trying to compare grows to a 600w HPS, but frankly now even if I use the same amount of electric power, if the results in both weight and quality are superior, that is what counts. My new hy-bred uses about 640watts of light, so I hope it can compare favoribly to a 600watt HPS. If not I really am going backwards here.Keep it civil please, gentlemen. -StinkyAttic
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