For the LED Savvy

[miami dolfan]

I asked the guy who I am buying the LED Fixtures about NM and Kelvin. This is what he responded:

let me explain the NM and Kelvin. Firstly, NM(namometer) is the definition of Red,blue,Orange,purple,green,yellow,ir,uv etc those COLOR SPECTRUM. But white color is definited by the color tempereture(Kelvin) in LED industry. For example, the sunshine is white color from being visible to the human eyes, but it is mixed with all kinds of color(R,B,O,P,G,Y,IR,UV...).But we use color tempereture to say sunshine(white), and wavelength(NM) to other colors.
Red：615-650
Orange：600-615
yellow：580-595
green: 495-530
blue：450-480
purple：370-410
<span style="font-family: Verdana;">white: 2700k-20000k or more</span>
My led aquarium light is 50% blue(470nm) and 50% white(12000-14000k)

My lights can made with 90degree or 120 degree.From the technology theoretically, the less beam angle, the more light gether on fixed lighting area, so the more penetration it gives. On the other hand, the cover area is also decided by hanging heights of lamp. I suggest the 90 degree lamp with 0.3-0.5m height hanging, which is best balance between penetration and covering size.

Is he right?? What is he talking about?

 

[jbadd99]

On which part?

 

[ichthyoid]

Overall he is on track, IMO. He is a little off on the bands for colors, but I'm not picking this a part.

 

[miami dolfan]

I have no clue as to what any of it means. I am just trying to determine if this fixture is worth buying because the price is right. I know it isn't the best, but for now it's good if it's worth it.

 

[crew]

he basically has an LED 50:50 light... the optics seem way off on the angles tho unless you have a shallow tank (less than 15 inches) usually you would want 60 degrees, not 90 or 120

 

[miami dolfan]

So, for a 30" deep tank a 90 degree angle is no good?

 

[jbadd99]

Miami Dolfan;653710 wrote: So, for a 30" deep tank a 90 degree angle is no good?

The lower the angle number, the further it will penetrate down, but the spread won't be as far out the sides...

In other words, the LEDs might make it to the bottom of your 30" tank, but it would take more LEDs to cover an area of, say 24" with 60 degree optics vs 120 degree optics.