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Thread: White LED experiment

  1. #65
    Zero's Avatar
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    AV,
    Any updates?
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  2. #66
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    Everything is still progressing nicely, Ill snap a pic this evening.... and I think its about time to try a cape maybe

    Ant, until I finish with the trials I cant recommend jumping into the water just yet


  3. #67
    Zero's Avatar
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    Av8,
    Thanks for the update.
    I feared the ping might be toast with that light intensity.
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  4. #68
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    Adam,

    I believe it is way too much as it is. Right now there is a halo of algae growth around the "bright spot" but none in the "bright spot". Very unexpected observation but this would seem to indicate it's way too intense. I think the ping is telling me the same thing as well.

    I can either increase the distance to the LED or decrease the output of the LED via the potentiometer. I'm leaning towards increasing the distance as this would also increase the LED's footprint.

    I really need a photocell at this point to get some comparative intensity data.

    Av

  5. #69
    Your one and only pest! Ant's Avatar
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    So, would a different lens be a better choice then? Instead of a 22 degree, use a 27? Also, would the problem of the shadows be fixed by using a grow chamber or rack with a reflective layer like mylar? Compared to when the ping was under the T5s, how far away from the light was it?

  6. #70
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    Ant, changing the auxiliary optic angle would be another option as well...

    Its still early but I think eventually the ideal optic angle will depend on the canopy vs. intensity needs. Nice thing is the optics are only 2 or 3USD ea.... but what is best for any application is still an unknown variable at this point.

    Since the light is so directional (at least with the current optics) compared to most other formats I'm not sure as to how much good Mylar would be.
    It may very well end up being no aux optics are needed (which makes the effective angle about 120 degrees IIRC), then the close distance and Mylar might work out perfect.

    Actually, the ping is a few inches closer to the LED then it was to the T5... but that was simply out of the convenience of using the ten gallon aquarium.

    But before I make any changes, I want to try different plants and get some baseline observations.... so probably D. capensis next.
    Last edited by Av8tor1; 06-23-2010 at 12:22 PM.

  7. #71
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    I don't pretend to understand most of this, but wouldn't some type of light scattering lens work better. I'm sorry for the non tech talk but I'm not well versed in this light/energy talk.
    The algae growth is a good thing in a way. Shows good light.
    Like I said, I don't know much about this at all.
    Peace,
    Zero

    ---------- Post added at 04:17 PM ---------- Previous post was at 03:55 PM ----------

    I was thinking. It hurts
    Is there anything like a camera lens that can change the direction of the light?
    I don't mean a actual camera lens but the concept
    Like turning it to put the lighting in a larger or smaller circle?
    You may be able to grow more then one plant under this light.
    My 3W LED flashlight is WAY too bright to shine in the eyes.
    There is an actual warning in the box saying don't let kids use it and don't shine in eye's.
    It put's a beam of light 300-400 yards very tight.
    I think LED optics have a way to go.
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    Zero
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  8. #72
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    Adam, I don't know of anyone who has adjustable aux optics that would be feasible in this application. The optic I chose to begin with was really a shot in the dark based on some marine hobbyist experiences. I did go with a "frosted" optic to get a little diffusion out of it.

    This is all new territory... up till now we just moved the plants to fit the lighting. Now we can fine tune the lighting to fit the plant. All it takes is just a twist of a knob or the angle of a 3USD optic. The potential is great.... Imagine an entire plant rack with each plant getting just the right amount of light. A plant that needed shade could sit inches from a sun loving plant and both be in ideal lighting conditions.

    A paradigm shift in plant lighting

    Personally I think we are still a few years away from widespread horticultural use.... but not many. If they were cheaper it would already be easy to fill the area above a plant rack with 15 or 20 of these units and have their outputs adjustable.
    It's now mainly a matter of cost and figuring out how to use them.
    Last edited by Av8tor1; 06-23-2010 at 02:10 PM.

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