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And it certainly shows, all I'm asking for is some kind of semi-scientific test. For in reality all we want to know is, if we got 100W of electricity, what is the most efficient way of distribute that to facilitate plant growth. So if using 5W to spin the plant around on a pedestal enables us...

And I'm still not convinced if all this wide spectrum focus is hype or science For I keep coming back to this "Illumitex Horticulture LEDs in World's largest Indoor Vertical Farm" From Lumitex website. And it looks like you can buy the LED's from here...

Great information, but the LEDs are not that narrow, or am I reading you wrong. Looking at the chart I would say 75% of the light is 50nm wide Luxeon Star Royal Blue Source click image: Now lasers on the other hand they are narrow. I wonder how a seedling would act if illuminated by a red...

Your welcome. No unfortunately not, since they have common ground. And even thou there is 7V between +12v and +5v with witch you can run a 12V fan slowed down on, you can't draw any serious current that way, the power supply protect itself and shuts down. I tested it 30 seconds ago on a...

Looking at this picture there is some burning at the tip of the leafs - I saw the same on some of my 3 weeks old plants and moved the light higher. Lack of light ruled out. x The only other thing I note is the soil composition, are you used to grow in that mix? for the last time I saw...

In that case I would put something to diffuse the light in front of the camera, something very standard like a white plastic bag or what else that can be picked up on far away. 80g/m2 A4 paper maybe :-)

It's irrelevant what name we give the number so long as it is the same hardware and software. of course you can not use it as a real calibrated lux meter and use the numbers to compare with that. But there are many other possibility's for it's use - light distribution in the grow room, output...

I thought about how people could measure the output from there panels, and a lumen apps came to mind, if people got the same phone and apps then a rough comparing can be done. http://www.google.dk/search?q=lumen+meter+apps&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:da:official&client=firefox-a...

I've just looked at that chart at thought, that's a dramatic rise in current on such a small voltage deviation, not good.:fire: But how is that visible when connecting LED in series. Parallel: using 3V DC supply 2.9V = 450mA 3.0V = 700mA 3.1V = 1000mA Serial: using 12V DC supply powering a...

Yes, good info and true - but could also be a bad excuse from the lamp manufacturer to buy cheap 3 grade LEDs (Bin's) or cut down on cooling to save $. A example maybe is this lamp...

Thanks. I'm trying too visualize what a optimal even canopy center intensity - directly on top of the plant - DIY grow light should look like. 120° -60° -30° lenses and slanted some degrees maybe. Mounting a flat plate on a curved surface for heat distribution is not good, so the heatsink...

The current limiting function has allays been in use when you mounted a 5mm LED to 12 volt via a resistor. On this page there is a calculator for finding the ohm value to limit the voltage to operational levels -Great if you want to use a small led in a car. http://led.linear1.org/1led.wiz...

It's another LED but the principle is the same. Actually is the other way around, if you start from zero and increase the voltage then at 2.2V it should draw 500mA, and if it starts to draw more then the LED driver turns down the voltage. That's why it's called a constant current driver vs...

This one: LED_PSU_CONTROL.pdf my modules use ~36V and I want to be able to dim them, and since this is MajorCoco home made light thread the talk was about driving his two 85W white LED's or something like it, at least in my mind but I'm on drugs so I might have run with the assumption that this...

What wattage was your HPS running at before ? and do the 430W LED do better than before.

Good link thanks ! And the seedling did have line of sight to two rows of blue LED's. Figure 1. Time-lapse image series showing the phototropism response of an oat seedling. After 3 days of growth in the dark, the oat seedling was exposed to dim blue light from the left hand side for 9...

I was measuring the output from a E27 3x1W(4W actual/1W driver loss) warm white LED spot at 3-4 inches away there is about 1500uMol in the center, so i thought why not do a micro veg After a few minutes the plant raises the leafs, don't know for sure if that's a sign of joy(live concert...

Please read these two posts if you think white light is best for plants vs. red and blue only. https://www.rollitup.org/led-other-lighting/530144-self-made-led-panel-general-3.html#post7490592 https://www.rollitup.org/led-other-lighting/530144-self-made-led-panel-general-3.html#post7491056 I...

NO Not but judging from the pictures from this test: 440W' HPS vs. 70W' https://www.rollitup.org/led-other-lighting/530144-self-made-led-panel-general-3.html#post7490849 ' Real draw used. And your link is a picture of a plant rated 147 watt, what ! :-)

Since you got the drivers and the heatsinks already, sell your white LED's on e-bay and buy some big ass red and blue ones. :lol: Unless you've never owned a HPS before, in that case you properly has to go through HPS to feel like a real grower like the rest of us. And they do have one huge...