One of the Experimental Light Study Sites (image) Netherlands Institute of Ecology (NIOO-KNAW) Share Print E-Mail Caption The red light posts are placed in otherwise undisturbed natural areas, to be able to measure the effect of light pollution. And to compare the differences between different colours of light. Credit Kamiel Spoelstra / NIOO-KNAW Usage Restrictions Only to be used in combination with the subject of the accompanying press release. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.