An employer shall ensure that the emergency sources of lighting prescribed by subregulation (4) -
(a) are capable of being activated within 15 seconds of the failure of the lighting prescribed by subregulation
(1);
(b) will last long enough to ensure the safe evacuation of all indoor workplaces;
(c) are kept in good working order and tested for efficient operation at intervals of not more than three months;
and
(d) where directional luminaries are installed, these are mounted at a height of not less than two metres above
floor level and are not aimed between 10 degrees above and 45 degrees below the horizontal line on which
they are installed.