Lighting apparatus

A lighting apparatus, comprising:

• a plastic cover with an edge portion, a light passing cover and a connection column;
• a trumpet housing with a widened section and a neck portion, wherein a top end of the neck portion is coupled to a bottom end of the widened section, wherein a diameter of the widened section increases through a tapered transition from the bottom end of the widened section to a top end of the widened section;
• and
• a light source plate, mounted with an LED module on a front surface, wherein the light source plate is fixed to an inner structure of trumpet housing, wherein the connection column engages the front surface of the light source plate, wherein the edge portion of the plastic cover engages the top end of the widen section of the trumpet housing, wherein the connection column has a hook passing through a column hole of light source plate to fix the plastic cover to the trumpet housing, wherein the plastic cover is rotated after the hook passes through the column hole for lock the hook on a back surface of the light source plate, wherein a gear structure is disposed on the light source for providing multiple gear positions for the hook to stay to configure an optical parameter of the LED modules.