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kelvin, light & color temp

This is a discussion on kelvin, light & color temp within the Beginner Planted Aquarium forums, part of the Beginner Freshwater Aquarium category; --> quantum, do some research...

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kelvin, light & color temp
Old 10-05-2012, 11:35 PM   #31
 
quantum, do some research
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Old 10-06-2012, 12:01 AM   #32
 
quantum, do some research

because the sun,


does not equal 5500-6000k here


where does white light come from ?
the electromagnetic spectrums visible light does not have "white light" just the colors of the rainbow

even the sun does not have a smooth curve on earths surface

so enlighten everyone on "white light"
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Old 10-06-2012, 10:02 AM   #33
pop
 
Hello Sirs:
Reading your post has left me feeling that I have fallen off my horse and cant get back on. Your Goliath-an points are way above me. All I want to do is consider whether I can have live plants in the aquarium…… I am starting to think I should go with old school style and plastic plants.


Again thank you for the valuable information and food for thought enough to gain 50 lbs.
pop
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Old 10-06-2012, 10:59 AM   #34
 
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sorry to get so off topic pop

a deep understanding of the scientific theory is not necessary to sucessfully keep a planted aquarium, a basic T8 fluorescent fixture with a bulb that approximates sunlight (around 6500K), some easy plants to begin with and a good comprehensive fertilizer is all that is really needed

if you list the dimensions of your tank, maybe we can suggest an appropriate fixture
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Old 10-06-2012, 11:05 AM   #35
 
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to flear: in post 32 you are trying to compare to dissimilar things, so the answer to why they are not equal is because they are not equal

'do some research' yourself, you don't have to go far, I've explained the white appearance of sunlight and 6500 K fluorescent lighting in this very thread
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Old 10-06-2012, 11:08 AM   #36
 
Quote:
Originally Posted by pop View Post
Hello Sirs:
Reading your post has left me feeling that I have fallen off my horse and cant get back on. Your Goliath-an points are way above me. All I want to do is consider whether I can have live plants in the aquarium…… I am starting to think I should go with old school style and plastic plants.


Again thank you for the valuable information and food for thought enough to gain 50 lbs.
pop
Way to easy to answer. Sure you can have plants, all you need is the curly cue flourescent light (compact flourescent). That sustains plant life. Then there is the always Reef lighting pattern, which FW can always use, but don't because of the cost. But, these lights look alot better and pleasing to the eye than the Compact Flourescent lights that are normaly used.
Don't worry about the Red's Greens and such, you'll only end up with a headache, which isnt' needed. Unless your going with LED's don't even worry about the Red Spectrum.
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Old 10-06-2012, 11:21 AM   #37
 
plants, yes, 6500k lighting is prefered
looking in more detail if the packaging allows the spectum is best in an "m" shape
lots of blues, greens are for our benefit, lots of reds

the sylvia grolux bulbs seem to have spent the greatest effort on mimicking the plants preferences, as such they don't have a kelvin rating

as for how much light is needed for your plants to thrive, that was the beginning of my research.
i've got 4x24watt in my 29gallon tank and my plants are doing great. all i can say is there is at least enough, i do not know if half that is sufficient or not

the 2watts per gallon rule is a basic rule of thumb when you have nothing else to go on, so i've got a little under 4wpg

if the tank was only half full, it would still be the same realistic light hitting the plants as the light only comes from the top and the footprint of the tank has not changed even if the gallons are half

the more accurate an answer you want the harder it is to give a simpe explanation of why.

basic rules of thumb, 6500k, or i'd recommend the grolux lights, prefereably T5HO (high output)
and just "enough" lighting.

there are single light hoods out there, there are doubles, 4, 6, 8 bulb hoods
then there is compact florecents as well

so you find "enough"
and thats somewhere beteween how much you want that particular plant, is it doing well enough with your current light(s), if you need more, how much can you afford

i'd recommend aquatrader.com for prices, they are cheap, so you get what you pay for, but what you get is woth it. my lights cost me $100 (including shipping). other manufacturers you can find online would have cost me 4x that, would have had the quality to back it up, but couldn't afford it
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Old 10-15-2012, 02:08 AM   #38
 
finding with distance of light from plants, ...

yes distance is noticable the more water it passes through., at 24" deep it's not a minor difference either

a T5HO bulb, little over 1/2" wide is producing all it's light.
it's radiating from this thin tube to cover as wide as your tank is, and is lighting outside of the tank as well.
the light is never directed just down either. reflectors (good reflectors help, but ...)

right next to the bulb, the neighboring 1/2" is getting 100% of the light,
4" away, it's less than 50% just because the same 1/2" wide light is lighting more than 1/2"

it's not water absorbtion, it's just the same width light is lighting more and more area with the same photon source.

if 100% of the light was all to be reflected back into the tank, then indeed a 24" tank, or a 36" tank, or a 48" tank would have marginal loss of light for each foot of depth.

outside of artifical lighting, either outside or from the sun, our light source is far enough away the light photons are far more parallel, and without reflection, each foot of water depth has marginal light loss.

this is the same as why a flashlight is good for reading right up close, but at the far side of the room you can't read what brand of basketball your looking at, yet even pointed at the basketball you can still see enough in the room to know where the furniture is so you won't stub your toe

not all the light went strait to the basketball, much lit elsewhere in the room.

a fishtank is no different, artifical lights are no different, they can light the top of the tank far better than the bottom because 24" away, the photons are spreading out to cover far more surface area from the same light source.

a PAR meter or a lumens meter identifies light intensity at a particular spot, photons fly as strait as an arrow, with only one direction out, not down, not "just in the tank" and photons don't get larger to cover more area the farther they get from their source to maintain a light intensity
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Old 12-21-2012, 08:09 AM   #39
 
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Technical Thread - YES

Informative Thread - YES

Fascinating Thread - To Me - YES

Flear: I use a Grolux bulb and have seen remarkable growth with minimal column ferts. The effect is as you describe with a very subdued purpilish effect. I know the tone is not for eveyone, but I LOVE IT!

Any idea where replacement GROLUX bulbs can be found?

Thanks to you, Quantum and the other who have taken their time to share within this thread.


Last edited by Tracy Bird; 12-21-2012 at 08:11 AM..
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Old 12-21-2012, 09:16 AM   #40
 
where ?, ... that's a good question
i don't think you can get them off their site :( (would have to double-check)
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