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Thread: Light spectrum

  1. #9

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    I use Sylvania gro-lux 4' bulbs over my growchamber. I had to do an internet search for the CRI and Kelvin ratings. According to several websites that sell them, their CRI is 89, and color temperature is 3400K, which is considerably lower than what is usually recommended. The 3400K does seem to match the color of the light output, thought, which is purplish, when you look right at the bulb. Nevertheless, the plants in the grow chamber are doing very well under them. The neps and dews, etc. are doing great, and I kept my vfts in there before I put them outside in mini bogs, and they put up flower stalks(or tried to anyway, I cut them off) and the traps were nice and red.
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  2. #10

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    I use a compact incandescent bulb with the "daylight" spectrum, which is 6500k and fits in your standard incandescent light fixture. The wattage isn't quite as high as I'd prefer (its 75 watt incandescent equivilant), but if you don't want to bother with tube lights or getting extra fixtures, its the way to go. So far my plants have responded quite well to it, far better than they were previously with a normal bulb.

    I wish I could put mine in the sun without them getting grilled. :P
    Some random words.

  3. #11
    Tony Paroubek's Avatar
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    5000k is considered sunlight (although your also correct that it is shifted slightly blue as you move away from the equator). A 6500k bulb would do just fine. Equally important as color is intensity. Particularly for VFT and other full sun loving plants! You would need several of the tube fixtures placed a few inches from the plants. Better yet would be some sort of high intensity lighting such as metal halide or sodium or high output fluorescent. You could also go for the high wattage compact fluorescent.

    They make 65watt 6500k compact fluorescent bulbs that screw into a standard light fixture. Or you could try the outdoor security light by Fluorex or Regent available at homedepot and lowes. These use a 65watt 6500k compact fluorescent bulb also.

    My opinion on the incandescent plant bulbs.. totally worthless. ALL incandesent bulbs produce a huge amount of red and infrared light ie HEAT. Getting the plants close enough to the bulb so they receive the proper intensity results in crispy plants. Move the bulb further away to keep the plants from frying and they don't get enough light.

    Tony
    Is that a Nepenthes in your pocket or you just happy to see me?

  4. #12
    Moderator Schmoderator Fluorescent fluorite, England PlantAKiss's Avatar
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    As Tony said...you must be careful when buying bulbs labeled "Plant Light". I bought one once...it looked kinda blueish like a plant tube. Upon closer inspection (AFTER I'd already bought it), I found out it was not a true "plant light" but an incandescent bulb with a kinda blue-ish film over it. And like Tony said...it got HOT. Totally worthless.

    I use a mix of Grow-Lux, cool whites and sometimes a SunStick. Works fine for me although I'd love to try MH sometime.
    "Fox terriers are born with about four times as much original sin in them as other dogs." - Jerome K. Jerome

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