[Code of Federal Regulations] [Title 46, Volume 4] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR131.840] [Page 462] TITLE 46_SHIPPING (This book contains parts 90 to 139) CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PART 131_OPERATIONS--Table of Contents Subpart H_Markings for Fire Equipment and Emergency Equipment Sec. 131.840 Emergency lighting. Emergency lighting must be marked with a letter ``E'' at least 13 millimeters (\1/2\-inch) high.