|That's good info, but 2700 is far to close to the red end of the spectrum to be that usable for photosynthesis, which requires higher wavelengths. I should know, I tried one before researching [img]http://www.**********.com/iB_html/non-cgi/emoticons/tounge.gif[/img].|
I was reading a similar thread (should have checked it first really) and here a reply by Tony Paroubek
It is in : Pet Flytrap Discussion Forums > General Discussion > Greenhouses, Terrariums and Bog Gardens > Fluorescents vs. compact fluorescents...
Joined: Oct. 2001
Posted: Sep. 06 2003,12[img]http://www.**********.com/iB_html/non-cgi/emoticons/wow.gif[/img]2
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.
Surely the 2700k light temp, being the same as HPS, would be suitable as a supplemental light ? No doubt a 4000k would produce more blue light = more usable light for growth though.
I'm sorry, I may have misunderstood what you meant by "supplemental light". What I meant was that a 2700 bulb won't provide much energy for the plant because they can't really photosynthesize much with it, though they will get some. It would work fine if you have them in sunlight for a good amount of the time. I thought you might have been like me. I put my plants in the sun on the weekends, and when I get home from work, but that's only a few hours/day on average so I need something they can live off of for the rest of the time. Tony is right though, a spectral graph is infinitely helpful in making a decision on a bulb.
Sorry for the misunderstanding. [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img]
I hope my post didn't come across as rude or anything (Sorry if so) [img]http://www.**********.com/iB_html/non-cgi/emoticons/confused.gif[/img]. You are right that the 4000k bulb is far more suitable than a 2700k.
Your post made me worried, as I recently put a 2700k, 25watt CFL over my traps (In the window sill), and thought perhaps the light frequency would be detremental to plant growth .
(Kinda like the way an incandesant bulb's light produces to much infra red)
Thats why I tried to find some other info out. However, I will replace the 2700k bulb (one I had lying around) with a 4000k bulb (next time I'm shopping), because of your advice! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img]
Cheers [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] ,
I'm using a 28 watt, 1750 lumen bulb to grow most of my collection (1 purpurea, 2 leucos and 3 VFTs), and they all seem happy and colorful. The VFT traps have a nice pink color, and even the leucos are turning red. Also, if you're growing plants under a light in a terrarium, I've heards it help to wrap at least three sides of it (leave one side open for viewing [img]http://www.**********.com/iB_html/non-cgi/emoticons/smile.gif[/img] ) with tinfoil. The foil will reflect light back onto your plants that would otherwise be lost. This is what I've done, and the plants seem happy.
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