Lighting apparatus

A lighting apparatus, comprising:

• a bracket to attach to an installation surface, wherein the bracket has a bracket hook, wherein the bracket hook is extended downwardly from the installation surface, wherein the bracket hook has a horizontal part and a vertical part, wherein an angle between horizontal part and the vertical is between 60 degrees to 120 degrees;
• a fixing unit having a plug, an elastic device and a unit housing, wherein the plug has a first end and a second end, wherein the plug and the elastic device are disposed in the unit housing, wherein the second end is coupled to the elastic device, wherein there is an adjustable entrance with a first diameter between the first end of the plug and the unit housing;
• and
• a light body having a back cover, a light source and a light opening, wherein the fixing unit is coupled to the back cover, wherein to install the light body to the installation surface, the adjustable entrance is enlarged by applying an external force to the fixing unit against an elastic force of the elastic device for the horizontal part of the bracket hook to pass through the adjustable entrance, wherein after the horizontal part of the bracket hook passes through the adjustable entrance, the elastic force recovers the adjustable entrance to the first diameter for coupling the fixing unit to the bracket to install the light body to the installation surface.