Plane-Lighting Homogeneity Image of a Planar Light Source Device through a Neutral Density Filter (image) American Institute of Physics Share Print E-Mail Caption This is a plane-lighting homogeneity image of a planar light source device through a neutral density filter. Credit N.Shimoi/Tohoku University Usage Restrictions This image may be used only with appropriate caption and credit. 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.