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About hermanni

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    Just Sprouted

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  1. What do you mean by intensity loss? I am talking about light per area, and as light doesn't disappear on the way (except for absorbtion in air & walls, ~0% and 95% in this case) the intensity should be about the same. The light of course comes from multiple directions so for a plant the intensity does get lower at some points, but on the other hand it gets the same amount but from different directions (which I see good). Greenhouses keep their lights very far from the canopy and I think the reason is the same we are talking here. They don't have walls that's a plus in their case, but the intensity loss would be great if it really did happen the way you suggest. They have multiple lights covering one area so they cover each other up, but I see it no different to having reflective walls at correct positions for the lamp to "help it self out" in the same way.
  2. Yeah true that. In distances 0 to 2 meters I don't see the intensity losing much to losses, does but not much (assuming the situation talked earlier, no light escaping the room/tent). I remember seeing numbers that suggest having for example the 1000de over about a 2m^2 area because the light from that is plenty for cannabis to grow great results. If on the other hand the OP has a bulb nowhere close the output then 6x4 will require more light, I agree.
  3. Yeah, I get that law and no objections to that, the spread widens as distance grows and so intensity gets lower quick. If you put a magnifying glass at some distance that captures all the light that point, say 3 feet, and it focuses the light back to a single point the intensity at that point would be very close to the intensity at 0 feet from source, that is what I mean. No magnifying glasses in my garden, but having walls reflect do the same thing, reflect the light back to where it belongs, so intensity over the area stays about the same. Not talking about taking the light 100 feet away, just so that the spread/distribution gets even.
  4. I think we speak of the same thing, the photons are spread over a larger area when distance grows, per the inverse square law. What I was meaning is that no photons are lost due to distance so if you get them all by directly or from reflections (walls etc) to the same destination (grow area) then there's no light lost and the spread got more even probably. The point is to get the most even spread to an area and at the same time lose no light. To get this I have put up my reflector higher and allow reflections from mylar walls. There's always losses everywhere but I guess it's better than having light only from one direction (without wall reflections) and relying only to the spread of the reflector which is not perfect. Please do, either I have a huge hole in my understanding of this or we are speaking of different thigns.
  5. The strength of the light decreases over distance? Photon is a photon look it any way you want and atmosphere does absorb some of those in the path, but regarding distances like 0-100cm the effect is almost close to none.. The spread is wider as distance grows that's true, but that doesn't harm as the point is to get even light spread, not high intensity at some spot. Just to give an example, the 1000DE bulb gives ~2200umol per sec and that divided by the 4x6 grow space gives about 1000 umol per sec per m2 which is (also per the Jedi's words) great for growing all kinds of plats. This is of course under the assumption that you get the light spread evenly. This is starting to sound like an Gavita advertisement, but let's continue anyways =) The HR96 reflector with the 1000DE model has a wide throw that is close to 1.5 wider than long, so 6x4 space would be ideal in that case and as an owner of such you must know that the spread is very even without any wall reflections, just on its own. So what I'm saying is that having this reflector in the said space would fill the whole area quite nicely and better yet if you would get it a little higher than the bare minimum to get side light too from walls (assuming there is such). Edit: back to topic a bit more, not knowing the efficiency of the OPs bulb, the HR96 reflector could be a better solution than multiple lights as the light intensity could be already enough to cover a larger area. I'm no expert in what light levels are sufficient and all configurations are different, but I have understood that if you have excessive light it won't help as much as would spreading that light over a larger area with more plants. So having the 1000 watter cover a larger area could actually increase the yield.
  6. Well there's a lot of different opinions of what's perfect, but even growth and measured by eye the spread is even except for the little brighter part at ~0.5m at both sides from the center. Of course there's spots with less light, but the Gavita's HR96 reflector seems ideal in wide non-square spaces (mine is 200 x 110 to be exact). I think 6x4 would be closer to the throw of this reflector. Just saying, gregster you could take a look at other reflectors that could do the job instead of a mover.Many are designed to mimic square throw, but at least this one isnt so it covers wider spaces nicely.
  7. Why won't you allow me research this type of fan and see if its any good? It doesn't seem to matter what I say, there's always something wrong with it.
  8. Success in a way that having 1150 watts of light in such a small tent and just that as means of circulating air is success to my eyes, the yield of 1kg+ doesn't point to the other direction either.. It's true he used a large extractor fan so that itself already creates a whirlpool in there, but I would still like to see that tangential thing helped the canopy temps. I hope Sannie sees this thread and gives his opinion about the efficiency of the fan, I could be totally wrong too as I have no experience with this setup and not seen one used in the way I'm planning. If it doesn't work then turning it to blow the thin "curtain" of air to the canopy is good too, but yeah then it's far from optimal. The alignment is a bonus, takes less space and as another bonus, takes less electricity than multiple regular fans (that I for example have currently at the corners, clip-on-fans). Looks handy and if it does its job then I see an improvement upon regular fans.
  9. You are correct it isn't enough to suck air from every point of the canopy, but seeing Sannie have success with it within a such a small tent gives me confidence it should be enough =) Currently I have fans at the corners of the grow area and that works pretty fine, but I'm always in for reducing the electricity consumption and these blowers seem to move quite a bit of air with a little wattage. I will try one out and be back with comments, lets see!
  10. That's a quote from Sannie for the very same pic in the top of this thread.
  11. Here's an image from google search about the way airflow happens in these units: For example these are used in the applications you say and above doorways to keep inside & outside air separate, thus the name "air curtain" for the device. It of course affects how the blades are shaped, I guess you could have the thing operating in the exact opposite way too..
  12. I dont have the reflector close to canopy, it's quite high (~100cm atm but will get a ltitle closer as those ladies grow) and the reflections from walls help.
  13. The tangential fans work in reverse of what you think. Thank you for the info, one step further of actually finding the same unit =) If it was a part from a car or something this would be easier but printers..
  14. A reflector that has a wide throw would do the same job as a mover and even better if you can move the light up some and have reflections off the walls (buds on the sides get light from both sides, not just directional light straight from the bulb / reflector). Take a look at Gavita's reflectors or even upgrade to the 1000DE pro system of theirs. I have one over a 2m x 1m table with reflective walls around it and the spread is perfect. Just the same amount of light at the edges that in the middle, there's a slight (like 10%) hotspot at around 0.5m from the center in my setup.
  15. The good part about the tangential fan is that it sucks air from the canopy and blows it directly upwards which is of course nice if you have your exhaust vents / extractor fan there =) Also they are generally pretty silent but still move huge amounts of air, they don't need to generate much pressure as they are only for air circulation purposes. The one one ebay in your link for example would be great. I was planning in buying quite a similar (a little wider though) unit and have it possibly without any safety caging at the far part of my tent (not a tent actually but close enough, would be pretty safe placing it there). santero: I have taken a look at those fans you mentioned but they for some reason tend to consume more wattage than just the bare units, but the positive side would be that by modifying the case you could get it working like they work "naked" but with safety added. If I do this I will definitely put up a DIY guide here.
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