User Tag List

Informational! Informational!:  0
Likes Likes:  0
Results 1 to 8 of 8

Thread: Fluorescents vs. compact fluorescents...

  1. #1

    Join Date
    Jan 2003
    Location
    Palm Springs, CA
    Posts
    840
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Can anyone tell me what the comparison of fluorescent lighting (cool white 40w 4' tube) and compact fluorescent (27w spiral) would be at one foot away?

    I know that compact fluorescents can push the light a bit further than a standard tube, but how much of a difference is it?
    Lithops care info: If you take care of it, it will die.

  2. #2
    Tony Paroubek's Avatar
    Join Date
    Oct 2001
    Location
    Far Away NY
    Posts
    4,640
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Easier to talk in Lumens when comparing different types of lighting. It is a more direct measure of how much light a bulb puts out instead of how much energy it burns when lit.

    Your question is more a matter of luminance or amount of light for a given area usually measured as footcandles or lux.

    Fluorescent as well as compact fluorescent come in normal, high output and very high output.

    A normal 40watt compact fluorescent will put out the same light as a normal straight tube fluorescent. The advantage of the compact is that you can fit more in the same area which gives you more light for the same area. The reason you can put the compact fluorescent further away if your lighting a small area is the light is more focused from a single point vs a narrow 4foot long line.

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

  3. #3

    Join Date
    Jan 2003
    Location
    Palm Springs, CA
    Posts
    840
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks Tony, yeah, I was having problems figuring out how to phrase that. I'm just trying to figure out the best way to get light to a further distance from the bulb. So far maybe a mirrored bottom, but that seems almost silly. [img]http://www.**********.com/iB_html/non-cgi/emoticons/tounge.gif[/img]

    I just remembered that I had two 27w spiral compact fluorescents above a ten gallon tank and the plants were doing great, seemed like a good amount of light got to them. Then I switched to two 40w fluorescent tubes and it almost didn't seem like the plants at the bottom of the tank were receiving the same amount of light.
    Lithops care info: If you take care of it, it will die.

  4. #4

    Join Date
    Oct 2002
    Location
    Ontario
    Posts
    237
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Here is a fluorescent you might want to try.

    I just ordered it so I have not tested it out as of yet. It is not full spectrum but similar in color to hps lighting (2700k). If you shop around or check ebay they are selling the same bulb for over two times the price.
    hight output fluorescent

    I have used flourex in the past but , I found the bulb did not last as long. My larger concern was that security light seems very poorly made, perhaps even a fire hazard? The unit became discoloured inside, a brownish color with a odd smell to it and the plastic clamps that hold the bulb became brittle and broke. Some posts that I have seen also stated that the output claims of Flourex are false.

  5. #5
    Moderator
    Join Date
    Jun 2002
    Location
    Westchester County, New York
    Posts
    5,377
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The specs on that bulb are good, accept for the color temp. Isn't 2700k a little low? Usually 5000k is around where you want to be, or am I way off base here? [img]http://www.**********.com/iB_html/non-cgi/emoticons/confused.gif[/img]
    17 Nash Rd.
    North Salem, NY 10560

    YOU! Outta my gene pool!

  6. #6

    Join Date
    Jan 2003
    Location
    Palm Springs, CA
    Posts
    840
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    2700k is warm white light, as opposed to what most of us use which would be cool white light.

    Plants generally use the blues and reds out of the spectrum. Warm fluorescents enhance warm tones (reds, oranges, yellows...wood [img]http://www.**********.com/iB_html/non-cgi/emoticons/tounge.gif[/img] ) and cool enhances cool tones (blues, greens, grays, whites). So i'd say that that bulb gives off more red light in the spectrum, right? Balanced out with a cool white and you'd have both covered. If you could find the same type bulb in a cool version.

    That is kind of nice though. Would do well as a supplemental light.

    You can find a 5000k version though, but so far it's been too expensive to even think about.
    Lithops care info: If you take care of it, it will die.

  7. #7

    Join Date
    Oct 2002
    Location
    Ontario
    Posts
    237
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Its similar to the color of a high pressure sodium light. Which is used in most Hydroponic gardens.

    I just checked eBay and a 95 watt version same color (2700k) marketed just for plants is $69.00.

    I plan on using the 105 Wyatt one I ordered with two 30 Wyatt 6500k compact fluorescents.

  8. #8
    Tony Paroubek's Avatar
    Join Date
    Oct 2001
    Location
    Far Away NY
    Posts
    4,640
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    HPS is used in most greenhouses as a supplement to sunlight, extend the day for long day plants, and to induce flowering. The bulbs are not there to grow the plants! If your plants are growing solely on artificial light then normal HPS alone is not what you want (or bulbs similar to HPS spectrum). It can be used but must be supplimented with metal halide or some other bulb capable of high levels of blue.

    Keep in mind that spectrum is only a general measurement to judge what color light a bulb produces. The only way to know for sure exactly what the bulb produces in usuable light for plant growth is to look at a spectral graph of the bulb.

    Watts mean very little other than how much energy the bulb uses when lit. Lumens is a measure of how much light is emitted and a better way to compare between bulbs.

    Seedling - Your setup sounds like a good mix between the 3 bulbs your using.

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

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •