This might help, seems to be more pro's than con's.

http://www.icel.co.uk/fi...ed_jh-pdf-1371043404.pdf

automatic testing is the way forward, its automatically logged and saves money on testing/Manpower I do emergency lighting designs for Universities, Schools, Public Buildings, Hospitals, they carryout minor repairs/rectify faults very effective systems.

However people think these systems are expensive yes this is true but the payback period depending on the quantity of luminaires is 2 years and most companies offer 4 years warranty, products now are all becoming LED and even less maintenance required.