In the City of LA [under their jurisdiction] there is a lot of stringent code compliance issues regarding Emergency Lighting equipment, including the direction that the heads are aimed, along with the output lumens and total foot-candles spread in a given area. In these situations, such as where stairs are part of the Fire Rated Corridor [Excape, or Evacuation tunnel], it might be better to use Fluorescent strips with Back-Up Ballasts.
In the working space [office floor areas] on high rises, a combination of Fluorescent fixtures with Back-Up Ballasts are used in conjunction to the "Bug-Eye" spots. Exit lights are also Back-Up power supplied. There are 1/2 of the Fluorescent fixtures on Emergency Power System, the other half on a dedicated circuit. All these are Night Lights [unswitched]. Exit lights are supplied from both the Emergency Power System and a separate dedicated circuit from normal power, along with battery back-up. Bug-eyes are split up same as the Fluorescent fixtures [typical 2x2s or 2x4 T-Bar Fluorescent fixtures are used for the Night Lights/ E lights, being unswitched and including Back-Up Ballasts].
I'm telling you, a guy could really lose his shirt by not being familiar with all the Fire/Life/Safety [FLS] codes! I saw an alarm vendor go through 6 separate re-schedules for Inspection, only to remove the equipment they installed and install the compatable equipment for the existing system [Simplex], then go through another 6 different tests and re-schedules before finally passing!!
Beware of that possibility!! :-)
When a typical remodel project involves locations that use E-Lights, they need to be operating properly and able to be tested before building final. Fire inspector [or if the Electrical Inspector is involved also] will not sign the card until they are functioning correctly.
Bring this to the attention of whoever does the bids for your company, along with supervisors or directly to the Electrical Contractor, so it can be figured into the price of remodel / TIs, along with not being a last minute suprise.
The complexity will depend on the AHJ.
Hope this is in the direction you were looking for