A lighting apparatus includes a light-sheet assembly configured to conform to the rooftop. The light-sheet assembly extends at least one-half the length of the rooftop, and further extends at least one-half the width of the rooftop when mounted to the rooftop. The light-sheet assembly further includes a plurality of light emitting diode (LED) lights that are distributed about the rooftop when the light-sheet assembly is mounted to the rooftop. A controller is communicably coupled to the light-sheet assembly and configured to operate the plurality of LED lights. A roof-mount is affixed to the light-sheet assembly and configured to mount the light-sheet assembly to the rooftop of the emergency vehicle. The lighting apparatus is useful for emergency vehicles.