Led lighting device

A light-emitting diode (LED) lighting device comprising:

• a seat comprising a baseplate and a sidewall, the sidewall defining a periphery of the baseplate and forming a chamber with the baseplate;
• a light source disposed in the chamber and attached to a surface of the baseplate, the light source comprising a plurality of LED arrays;
• an electric power source disposed in the chamber and electrically connecting to the light source;
• and
• an optical assembly disposed on the light source, the optical assembly comprising an optical unit and an installing unit, the installing unit connecting to the periphery of the optical unit, wherein the optical unit comprises a plurality of first optical members and a plurality of second optical members, one of the first optical members covers one of the LED arrays and the second optical members interposed between two adjacent first optical members, the second optical members further comprise a plurality of optical walls surrounding each of the first optical members,
• wherein the installing unit includes a wall portion surrounding the sidewall of the seat and, the wall portion comprises a bending portion abutting against an end of the sidewall, such that the installing unit fixes the optical assembly on the seat.