Today on BRStv, we have a brand new episode for our series, BRStv Investigates. In this series we explore popular reefing theories, products, methods, and what the manuals are missing, with a focus on putting them to the test! This week we are taking a dive into PAR testing lights and if that should be conducted in air or water and how water can impact the readings. PAR values will be much more stable in air but since our aquariums do have water a majority of light output testing should be conducted in a tank with water. There are a few different factors like reflection, refraction, and water clarity that can change how light is emitted around a reef tank. So follow along as we answer today's question, provide some helpful insight, and help make reefing just bit more fun and easy for you and your tank. Be sure to watch and keep an eye out for future episodes as we test spread, PAR, coverage, efficiency and more! *Legal Stuff* The purpose and content of this video is to provide general information regarding the products and their applications as presented in the video. Aquatic sales solutions, inc. And its officers, directors, employees and agents disclaim all express or implied warranties, in any way, related to the products and their application as presented in this video, make no representation or warranty regarding the products and the application as presented in this video and shall not be liable for any direct or indirect losses or damages of any type, including but not limited to punitive damages, or from personal injury or death resulting from or in any manner related to the video, and the products in and contents of the video. The viewer expressly agrees that aquatic sales solutions, inc. And its officers, directors, employees and agents shall not be liable for any damages or losses related to the products in and content of the video and hereby agrees to hold the foregoing harmless from any such losses or damages.