Posted: Tue Jul 05, 2016 1:50 am Post subject: Lightning Spectrum for planted tanks
1.What part of the light spectrum do plants needs for photosynthesis?
2.Do different light fixtures produce different light?
3.What is "K" rating means?
4.What does 6500K means?
5.How does one measure light quality,output,from a light fixture,does quality matter?
superb. Nice tank with healthy growth. I am facing an issue of light scattering. I have installed 36w*2 PLL. But most of light is escaped through downward direction.
Please post internal image for light fixture.
Joined: Jun 11, 2008 Posts: 3504 Location: Mumbai, Bharat (AKA...INDIA)
Posted: Wed Jul 13, 2016 6:35 pm Post subject: Re: Lightning Spectrum for planted tanks
Ok friends presuming that you all have read the threads above, provided in the links, I would like to demonstrate the same thing in layman's language.
As you can see that there is a good difference in lighting in the above pictures.
But the major focus is on good growth (thick, dense growth) greenery and wherever colour, it should give immense satisfaction in the efforts put towards it.
We buy plants from various vendors and especially the red plants would simply turn green or die off.
we also have to play with fertilisers to keep up growth and fine tune the colour. Needlessly these efforts remain limited in output.
So how does lights effect the plants?
How does fertilisers work in different types of substrates?
How does colour show up with all these combinations?
Breaking the Red plant codes
we normally use lots of light, (I mean many lights) all are those 6500K , some are cool daylight, some are plain white, some are just not known.
all these lights are white tubes. (of course there are also coloured tubes )
these lights are glass cylinders filled with certain gases and current is passed through it.
when current passes through these gases....., these gases blow-up to glow brightly into light- almost like Sunlight........ the sun, as we know gives out rays which have colours,
In man made lights, 1) the brightness is strong,..... 2) then stronger and.....3) then strongest- So 15Watts........18watts...........28watts..........36 watts etc etc.
The electric current has two things 1) Voltage = its the strength of the current (How sharp the current is), 2) Wattage = its the thickness of the current (How FAT the current is).
its like a pipe throwing water- a 5mm pipe will throw little water in 1 min...... a 3inch pipe will throw lots of water in 1 min (something like that) water is constant, but the thickness is different.
6500K lights will glow at all watts- but the light will reach at different lengths/distances. 15Watts will reach up to 3 feet (just for understanding) and 36watts will reach 6 feet.- that is called the intensity ( for the time being to understand)
But then As I mentioned earlier lights have rays and rays have colours-
so in 6500K there are many colours-.........Red, Blue Green, Yellow, etc etc.
6500K "K" means Kelvin,....... its a measuring unit -........ Kelvin is a "degree" of heat like Celsius, Fahrenheit etc
here the lights have various coloured rays- .....red will be about 9%,...... green will be about 60%,....... blue will be about 20%,....... yellow will be about 10% ..........and the rest of the colours in different %percentages.( its called CRI colour rendering Index)
this light is manufactured in such a way that human beings enjoy the brightness...... Human beings like green colour rays which is soothing to the eyes and comfortable. It was therefore made for home use.
All those gases filled in that 18" glass cylinder reaches 6500K white light (approximately 500 lumens) and brightens different area of rooms depending on the wattage- "Come ooooon we all know that " yeah I know.
@Kapil lift the hood about 2" higher, there is too much intensity. You may get algae very soon despite of co2.
there is lot of water flow if possible slow it down
buy RBG led strip and intensify the blue and red, suppress the green, it will suit your set-up. Those swirling of plants will stop and you will get straight stems, after you install RGB led strip
its 18X12X15 I suppose with aluminum foil
Are you sure to lift hood ?
because using only 36w pll now. And the plants are h.pinnaetifida, ludwigia repens, bacopa monneiri, green mint. So i think this much is must needed for these plants. Willing to make DIY LED hood soon.
I need few cuttings if you have.
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