This discreet round recessed emergency corridor spot downlight comes with an environmentally friendly long-life battery with a 3-hour duration during loss of supply. The diameter of the ONTEC C is just 90mm including the bezel and comes with a clamshell driver narrow enough to fit through the suggested 70mm diameter cut-out. With corridor optics and non-maintained LED lamps providing an emergency output of 140 lumens, it allows for spacing between fittings in escape routes or corridors of 21m at 3m heights.