As batteries are cycled, their charge is drained and then recharged to ensure they are operating at full capacity. It is important to consider when and how these cycles will occur, and the impact the timing of them could have.
If all luminaires on-site were to enter a testing cycle at roughly the same time, performance of the entire network would be compromised if an emergency scenario occurred while this was ongoing; with battery charge levels depleted, output duration is stunted.
An intelligent emergency luminaire should therefore conduct testing randomly to ensure there is never a significant proportion of luminaires undergoing a testing cycle at one time. This will help to avoid any unexpected duration shortages should an emergency scenario occur.