would you share your LUX-PAR readings?

[williah]

I'm tracking the amount of lighting I have in my tank. I have a 72 gal bowfront, which is 2 feet deep and 4 feet wide.
I have a 48" coralife Lunar Aqualight Deluxe with compact flourescent lights, 2 10K's & 2 actinic.

I let my lights go a year without changing (newbie stupidity) and since then I've been to tracking my light values. Now I wanted to get some other values to compare them to.

Would you mind posting your values if you have them.

I will be posting mine tonight, once I get home.:bum:

 

[tatuvaaj]

From my old tank (2 x 250W HQI):

 

[williah]

Thanks, tatuvaaj.

I'm not sure I know the numbers you're using.
For example, could you clarify for me, please? 484/10m: is 484 the Lux and 10m means what? Thanks.

In my tank, I recall I had 12,000 lux 1/2 inch below the surface, and 1,700 at 23" (sandbed). This is a rough memory, I'm still digging out the numbers. So your numbers seem low to me.

Just trying to be clear.
Thanks.

 

[tatuvaaj]

williah,

Those are PAR (or PPF) values in µmol m-2 s-1. Meters are depth in a reef where you could expect the same intensity (this of course can vary a lot).

 

[williah]

Thanks. I recognize them now.

I'll be posting mine late tonight NY City time.

 

[williah]

So here's my data. My tank is 24" tall. I took readings at: 1. just below the water surface, 2. 12", 3. 23" (on sand bed).

In LUX: 1. 5950; 2. 3110; 3.1350.

I converted to PAR using a conversion factor of 38. No sure if this is accurate as ALL the conversion tables don't list compaq florescents, just regular florescent. But I found one that might be correct.

So in PAR: 1. 157; 2. 82; 3. 36.


Does anyone have more PAR/LUX listings? Also, anyone know the correct compaq florescents variable for LUX-PAR conversion?

 

[GSMguy]

I think you actually need a PAR meter

 

[luther1200]

If you already have a meter you can just get the sensor.

 

[williah]

<a href=showthread.php?s=&postid=14950028#post14950028 target=_blank>Originally posted</a> by luther1200
If you already have a meter you can just get the sensor.

I have the Milwaukee Instruments Smart Lux Light Meter. How could I swap out the sensor on this?

 

[williah]

<a href=showthread.php?s=&postid=14949459#post14949459 target=_blank>Originally posted</a> by GSMguy
I think you actually need a PAR meter

Hi GSMguy,

From what I've read you can convert LUX to PAR by dividing by a coefficient. The coefficient value is based on the light source. The problem is I haven't found any value for CFs, just for regular flourescents. I'm working on a guess that my CFs have better PAR values than regular flourescent lights, as they seemed to be design for marine tank use.

I could be wrong but I'm still looking.