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Thread: T5 Bulb Brands?

  1. #41
    RL7836's Avatar
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    Sounds interesting, especially the 90 CRI part. I'm a tad less impressed with the $152 / 600 lumens part ... Although they mention that they use 20% less power, there seems to be a reluctance to publish actual power / lumen values for these LED setups (or have I just missed them??).

    I don't know about your 5 year timeline - at least for residential lighting (vs plant lighting). The advances / improvements seem to be coming at a pretty good rate. If the industry believes that energy efficiency is here to stay and the bottom won't fall out again like the 70's & 80's, they'll start to put some serious effort into research ...
    All the best,
    Ron
    You must do the thing you think you cannot do. --- Eleanor Roosevelt

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    (with Pics)

  2. #42
    Av8tor1's Avatar
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    oh the 5 yrs is for plant, residental is just around the corner... or already here

  3. #43
    DaJimmer's Avatar
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    Yo. I was lookin and i found some lighting rigs. http://www.littlegreenhouse.com/accessory/lights.shtml
    would you recommend trying somthing like the hydro farm to hang over my little collection?

  4. #44
    jimmy uphwiz's Avatar
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    nice find gregny better price than i've found .
    Thank you

  5. #45
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    I don't have any experience with that fixture or the bulb, so I cant really say..
    Also, the area you are going to illuminate and the plants you want to grow must be taken into consideration.

    However, my golden ratios are:

    40 watts per cubic foot for Heliamphora, Dionaea and Drosera
    30 watts per cubic foot for Cephalotus
    20 watts per cubic foot for Nepenthes and Pinguicula

    Of course there are exceptions

    Wattage values are real values, not any BS "equivalent" numbers. High quality bulbs and reflectors are also assumed.

    of course, ymmv
    Av

  6. #46
    Let's positive thinking! seedjar's Avatar
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    Cubic? How so? Obviously this must be an approximation, because it gives weird results for large and small n.
    Also seems strange to me that you have Neps and Pings at the bottom of the scale.
    ~Joe
    o//~ Livin' like a bug ain't easy / My old clothes don't seem to fit me /
    I got little tiny bug feet / I don't really know what bugs eat /
    Don't want no one steppin' on me / Now I'm sympathizin' with fleas /
    Livin' like a bug ain't easy / Livin' like a bug ain't easy... o//~

  7. #47
    Av8tor1's Avatar
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    Quote Originally Posted by seedjar View Post
    Cubic? How so? Obviously this must be an approximation, because it gives weird results for large and small n.
    Also seems strange to me that you have Neps and Pings at the bottom of the scale.
    ~Joe
    Let's take one of your 6 bulb T5's as an example.

    They are 320 watts of energy with an approx surface area of 8 square feet, so with a distance to plant at 12" this becomes 40w per cubic foot of energy dissipation.

    At 2' from the bulb this becomes 20 w per cubic foot (or 1/4 the energy per inverse square law)

    It seems to also work out well when using other types of fluorescent lamps...

    But here are some real world examples...

    Here is a heli in the 40w/cu. ft zone:


    Here are a couple neps in the 20w/cu. ft. zone:




    The red leafed hamata is a good 24-30" from the bulb

    But this only works if you have good bulbs/reflectors, no matter how much you polish a turd, its still crap

    Av

  8. #48
    Let's positive thinking! seedjar's Avatar
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    But the energy isn't absorbed evenly throughout the cubic area. The significant portion of absorption happens along surfaces in the space and (I think) approximates to two dimensions. Transparency of the air the light is passing through has a diminished effect on distribution next to solid objects. Are you talking about cubic feet of the growing space, or cubic feet of plant matter?
    ~Joe

    PS - Hey hey, speaking of polished turds, did you wax the back of your reflectors as well as the front? I remember you describing the corrosion in the past, but was is just bad for reflectivity or was it actually compromising the metal? I want mine to stay shiny... forever!!!
    o//~ Livin' like a bug ain't easy / My old clothes don't seem to fit me /
    I got little tiny bug feet / I don't really know what bugs eat /
    Don't want no one steppin' on me / Now I'm sympathizin' with fleas /
    Livin' like a bug ain't easy / Livin' like a bug ain't easy... o//~

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