Recent content by RiddleLabs

Aloha all, Sorry for the tardy reply. The x-axis on the graphs would represent distance from the lamp. I did not record that data since this article wasn't meant to compare lamp PPFD at any given distance. Instead I wanted to compare sensor response to PPFD. I've taken a bit of heat for not...

Richard, I have little doubt that, in some cases, you would find a statistically significant difference between measurements made by the Li-Cor and Apogee quantum meters. However, I think you have missed the point. Let’s look at some realistic scenarios: Porites coral Compensation Point: 50...

Richard, Richard Harker wrote: Rather than challenging my right to question the accuracy of your conclusions, why not address these reasonable questions? Reply: Richard, my patience with your games is wearing very thin. You know darn good and well that I stated the reasons for using a white...

Aloha Richard et al., My schedule has been much too busy to allow me to respond to your questions until now. I must agree with Terry Siegel – if there are any factual errors in this article, please state them specifically. I will categorically state the fallacies in your statements: Statement...

Aloha, Get an Apogee Instrument QMSW-SS quantum meter, with optional extra-length cable. Price is about $300. Sensor is cosine corrected, and has a response close to that of a LI-COR meter (~$1,500). See either www.apogee-inst.com or www.licor.com for details. Dana

Aloha Ricardo, Perhaps I can save Charles the trouble of being the middleman, and relay my observations. While working at Aquatic Wildlife a few years ago, we raised the alkalinity level dramatically by addition of a commercially available buffer. The next day, we noticed one of the...

Aloha Jake, To answer your questions: 1. I purchased batteries for the battery-eating digital water velocity meter (Marsh-McBirney FloMate 2000) and checked the water velocity within the chamber. With the magnetic stirrer set at 2.5 (of 10), I measured ~10 cm/sec (lower than what I crudely...