Hi Friends,
We are desiging lighting for our Float area ( Height from ground level - 10 Mtr) and we are planning to put Recessed Fl light 4 X 18 W with Battery and Without battery around 170 numbers.
Kindly can any one suggest that what should be the ratio of Lamps with battery to with out battery ( ie A lamp with battery back up should be provided with after x no of lamps without battery back up).