Book Review of Light, Water, Hydrogen: The Solar Generation of Hydrogen by Water Photoelectrolysis Light, Water, Hydrogen: The Solar Generation of Hydrogen by Water Photoelectrolysis . By Craig A. Grimes, Oomman K. Varghese, and Sudhir Ranjan  (Pennsylvania State University, University Park).   Springer Science + Business Media : New York . 2008 . xxiii + 546 pp. $129. ISBN 978-0-387-33198-0 .