Club PAR meter?

[SteelerMike]

I was just wondering if the club PAR meter was hanging around anywhere. My father, borther and I would like to use it to do some measurements with our reefbreeder lights to see what intensity we want to run them at. If anyone has it can you bring it to the meeting on Sunday so we can borrow it for a bit? TIA

 

[BfishLpond78]

I've been on the hunt for this thing with no luck for a long time.

Also, I believe you need a different par meter for LED's.

 

[SteelerMike]

Also, I believe you need a different par meter for LED's.[/QUOTE]

Oh, didn't know that..

 

[BfishLpond78]

I'm pretty sure the one we have, which is an Apogee par meter, will give you inaccurate readings, I'm not sure of the technical reason, but I know people get some crazy readings when using the standard par meters.

Hopefully someone can chime in with the technical reason.

 

[Marc11]

You are correct. I tried to use it on my Acan Prisms and the numbers were off the chart. However, that said i would love to get my hands on the meter again since I now have a MH/T5 unit.

 

[pecan2phat]

I might be wrong but the only meter that is considered accurate is a Li-Cor which cost over 3 grand.
Apogee has a error correction for each LED color spectrum:

Apogee PAR Sensors Spectral Errors Under Electric Lights
All Quantum/PAR sensors on the market experience a certain level of errors under different electric light sources. The following data can be used to adjust the PAR readings of Apogee Quantum sensors to achieve highly accurate readings. Please note that these errors apply only to quantum sensors that are pre-calibrated for electric lights, and for the Quantum Meter when it is set to "electric light" mode.

LED Type

Error [%] for Apogee Quantum Sensor
Cool White -4.2
Neutral White -6.1
Warm White -9.9
Blue (448 nm) -10.7
Green (524 nm) 5.8
Red (635 nm) 4.7
Red, Blue 2.7
Red, Green, Blue 3.5

Other Electric Lights

T5 Cool White Flourescent 0.0
T8 Cool White Flourescent -0.3
T12 Cool White Flourescent -1.2
Compact Flourescent -0.2
Metal Halide -3.9
High Pressure Sodium 0.8

 

[BfishLpond78]

I might be wrong but the only meter that is considered accurate is a Li-Cor which cost over 3 grand.

Chump change! Lets get one!!!

 

[captc07]

Chump change! Lets get one!!!

With this kind of demand I think the only logical option would be to get two!