This book is a study of unusual light phenomena, based on almost 400 unpublished accounts of modern-day encounters with strange lights collected over a period of thirty years, held at the University of Wales, Lampeter. It is an original and perennially topical book that goes beyond existing studies of unusual light phenomena - such as lights encountered during angelic experiences, near-death experiences, 'after death communications' - in a number of ways. It shows, for example, that experiences of unusual, spiritual, religious and paranormal lights are cross-cultural, trans-historical, and are reported widely in the present day: but not necessarily experienced when near to death.It also demonstrates that these experiences share to a remarkable degree a 'common core', showing by drawing on a large number of vivid, unpublished and dramatic testimonies that unusual lights typically manifest at times of crisis, and are overwhelmingly benign and loving, producing 'turning-points' in the lives of experients and typically setting them in new spiritual and creative directions.