This period of time is called the restrike time. Restrike times for traditional probe-start MH lamps can take 15 minutes or longer, but restrike times for pulse-start MH lamps are generally much shorter (see Figure 4). According to manufacturers' literature, restrike times for pulse-start MH lamps can be more than twice as fast as for probe-start MH lamps.
Overview. Unix (officially UNIX) is a registered trademark of The Open Group that refers to a family of computer operating systems and tools conforming to The Open Group Base Specification, Issue 7 (also known as POSIX.1-2008 or IEEE Std 1003.1 - 2008).
Some Basic UNIX Concepts. Every user has a unique username. When they logon to the system, they are placed in a HOME directory, which is a portion of the disk space reserved just for them. When you log onto a UNIX system, your main interface to the system is called the UNIX SHELL. This is the program that presents you with the dollar sign ($) prompt.