Originally Posted by Maya
In our research LEDs came out superior
in PAR and PUR. PAR is photosynthetically useful radiation
And is different than PAR which is photosynthetically active radiation. It's all about color spectrum and which uv
lighting is usable by the plant or animal. Zooanthella needs a 400- 550
Nanometer range in color spectrum. 620- 720 is the red bandwidth which is the
range of the upper spectrum necessary. Flourescents and compacts produce a lot of greens and yellows which aren't usable. Halides produce good PAR & PUR but quickly begin to fail as bulbs age. Here is a
Pretty good Link to explain the needs of the color Spectrum.
Aquarium Lighting; Kelvin, Nanometers, PAR, Bulb, Watt, MH, LED, Light Basics.
this is a very good link and it is important that we talk about spectrographs too. PAR can easily be fooled by blue LED
. Up the blue. up the PAR. Bad for your tank if it's not the right spectrum and you can only get that from a spectrograph. Many of the companys out there are using white that are only 6500k LED
and while they look bright they are giving off most light in the 520k to 650k range which is great for growing algae but not for corals.... This is also where the lumens comes in. Lumens is what our eyes see and it is not what our tanks need. Don't be fooled into thinking that anything with high lumens is good for your tank. With LED
it is important more now than ever to know what you are putting in your tank.
I clean my glass once a week at the most. I don't flood my living room with light, I have a brightly lit tank and am getting good growth. I am 100% LED
. All my frags start out small.