98mm wide; corona funnel-shaped. It may exhibit an orange rim at times. Sunproof.
Back Flash, 2 W-YYO, Dr. John R. Reed, United States, 2003
Photo #55207 Jason Delaney PHS Daffodils, USABack Flash, 2 W-YYO, Dr. John R. Reed, United States, 2003
Photo #50632 Dr. John R. Reed, USABack Flash, 2 W-YYO, Dr. John R. Reed, United States, 2003
Photo #35293 Kirby Fong, USABack Flash, 2 W-YYO, Dr. John R. Reed, United States, 2003
Photo #35292 Kirby Fong, USA