Apogee Correction Factors XR15s running AB+

[Huff747]

I rented a par meter MQ-510 and am trying to understand if I need to use correction factors and if so which ones. Anybody give me guidance on that? I'm running 3 XR15s on the RMS rail over a 6ft tank. I'm running the AB+ profile and I'm looking at the table in the manual and not exactly sure how to proceed. Any assistance would be appreciated.

Thanks.

 

[CC13]

Following

 

[Ocelaris]

Not sure, but I rented the 210 and watching. My understanding was that the 510 and the 210 have the underwater correction factor built in. Is that what you mean?

 

[Huff747]

That is my understanding as well that the underwater correction is built in. I was confused by the spectral error table in the manual but I found another table on their site:

https://www.apogeeinstruments.com/how-to-correct-for-spectral-errors-of-popular-light-sources/

It doesn't list Radions specifically but it lists quite a few lights and bulbs and for the most part the correction factors on the 510 are right around one so I decided I didn't need to worry much about any correction because even a correction of 1.08 on 200 par only makes it 216 par so in the end I decided just to go with what's on the meter.

 

[rc1626]

I have the Apogee SQ-520 sensor that connects to my computer via usb. When using the Apogee software it has an immersion setting that I check off when measuring underwater. Not sure what the difference is between the 510 and 520 or how different par measurements would be between the two. I've never checked the difference between checking off the immersion setting or not. I should at some point to see how different the readings are. Something tells me probably not enough to make a huge difference. I will try later this evening and report back.

 

[Ocelaris]

I was looking at the brs video on the wwc/brs sps hybrid yesterday and they had some 210/510 readings side by side for the wwc tanks. Basically the 210 was less than 10% off of the 510 (and many times spot on and sometimes high and sometimes low). So on a 200 par tank that's 20 par. The point being that were probably within 10% accuracy anyways, so as long as the immersion factor (1.33x) is already taken into account, I think it's probably a moot point for our purposes and there are other testing variances that make a bigger impact than the spectrum correction.