Is the emergency fluorescent floor lighting strip along the aisle an item on the MEL? Was travelling on a Airbus A320 (night flight) and during the safety briefing noticed that the  fluorescent floor lighting strip referred to in the evacuation instructions was totally absent.  Both sides of the aisle. 

I could see the marks on the floor carpet where it must have been earlier tacked on. Was removed and went unreplaced for whatever reason. 

Is it OK for an aircraft to fly without this item? Seemed pretty essential to me for a safe evacuation in the dark. 

Edit: I did try &amp; take a photo but unfortunately didn't come out so well.
Those lights don't have to be mounted to the floor. They can also be seat mounted. 

http://www.bruceind.com/index.php?option=com_k2&amp;view=item&amp;id=90:escape-path-lighting-systems&amp;Itemid=189

http://www.astronics.com/_images/aircraft-safety/EPM%20033010.pdf



This is the AC that provides guidance on the requirements of the system. http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC25.812-1A.pdf

The regulation is 14CFR 25.812