Custom LED PAR

[cobra2326]

So I built my own LED light using carclo optics and the following Emitters:

3x Cree XT-E Royal Blue
3x XP-E blue
3x SemiLEDs UV
3x Cree White (neutral)
1 Cree green
1 Osram Oslon Red

In my small 10g fusion I’m seeing PAR readings of 650 3” under the water and 450 at 6”, with the lights at 65%, the blue channels on max and the white at 25%. This is using the seneye reef.

This seems really high to me. The XR15w doesn’t even get these numbers and it’s got 1 extra of the important emitters. Maybe the seneye is wrong?

 

[Crabs McJones]

So I built my own LED light using carclo optics and the following Emitters:

3x Cree XT-E Royal Blue
3x XP-E blue
3x SemiLEDs UV
3x Cree White (neutral)
1 Cree green
1 Osram Oslon Red

In my small 10g fusion I’m seeing PAR readings of 650 3” under the water and 450 at 6”, with the lights at 65%, the blue channels on max and the white at 25%. This is using the seneye reef.

This seems really high to me. The XR15w doesn’t even get these numbers and it’s got 1 extra of the important emitters. Maybe the seneye is wrong?

How far off the waters surface are you taking these measurements? are you using some sort of lens or diffuser over the leds?

 

[cobra2326]

The light is 8” off the water and the depths I mentioned above. Optics are Carclo 60* (note this isn’t directly comparable to other manufacturers angles as this is FWHM).

I attached a photo of the setup. Sorry for the dirty tank

 

[Crabs McJones]

The light is 8” off the water and the depths I mentioned above. Optics are Carclo 60* (note this isn’t directly comparable to other manufacturers angles as this is FWHM).

I attached a photo of the setup. Sorry for the dirty tank

So they're 60 degree lenses? I think this might be why, you're focusing the light down more, the XR15W uses either 90 or 120 degree lenses which spreads it out more decreasing the par.

 

[cobra2326]

Yes, but that's 60 degress Full-Width Half Maximum. I have no idea if 120 degrees on the XR15W is full maximum or half, because they don't publish it. So I'm not sure.