This discreet surface-mount square emergency spot downlight comes with an environmentally friendly long-life battery with a 3-hour duration during loss of supply. The width of the ONTEC R is just 130mm and has a depth of 27mm from the ceiling or wall. With open area optics and non-maintained LED lamps providing an emergency output of 158 lumens, it allows for spacing between fittings of 8.8m at 3m heights or 11.8m at 5m heights.