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Old 10-02-2005, 12:41 PM   #1
higher
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Default Understanding Lighting Aspects 101

I've often encountered many forrumers asking, What's Kelvins, Lumens Etc,
And for those blindly following the WPG rule, you'll find that some people who have 8 WPG in a small tank don't have much algae problems.

Apart from a good fertilisation and water chemistry regime, what's essential is that we too understand what the aspects of lighting are.

After all, he who knows not what he speaks of, but speaks it all the same, appears to mock himself, No?

So here's a brief summary of what we speak of when we speak in terms of lighting.

Taken from Maculosus's Post in Marine Resources in this forum. More information avaliable there, though mostly in tuned with reefing. vbmenu_register("postmenu_2745440", true);

Quote:
Lumen – a unit of light striking a one square foot area of a sphere, 1 foot in radius with a point light source at the center. The total light from that source would then be 3.14 L. This is the standard for measuring artificial lighting.

Lux – equals one lumen striking an area of one square meter. This is standard for measuring sunlight intensity.

Kelvin Temperature – The temperature at which a body of matter will emit a given spectrum of electromagnetic radiation – light. 0 degree K equals –469 degrees Fahrenheit.

PAR (PPFD) – photosynthetic flux density. A measure of the light radiation available for use in photosynthesis

Fish only aquariums, which were the standard until the mid eighties, were easy to light. The fish lived in a spartan environment of dead rock and crushed coral. They only needed enough light to find food. With the advent of FOWLR and Reef Aquariums it was a whole new ballgame. Now you needed enough light to fuel photosynthesis based ecosystem. The questions were what kind of light, how much light, and how long. In each case we must also address the issue of too much or too little.
Hope this helps someone out there.

Cheer,
Jerome
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Old 11-02-2005, 03:08 PM   #2
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More info on lighting here:

http://retirees.uwaterloo.ca/~jerry/orchids/light.html
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Old 23-02-2005, 01:46 PM   #3
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a simple chart of color temperature.



Cheers
Vincent
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Old 23-02-2005, 10:22 PM   #4
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Default PL Light setup for various sizes



2ft PL sets


3ft PL sets


4ft PL sets


5ft PL sets
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