Downlight apparatus

A downlight apparatus, comprising:

• a rotation housing having a spherical inner surface and a bottom opening;
• a spherical housing having a spherical outer surface corresponding to the spherical inner surface;
• a light source disposed to a holder of the spherical housing, the holder being located inside the spherical housing, the light source emitting light through the bottom opening of the rotation housing;
• and
• an elastic structure pressing the spherical housing to engage the rotation housing applying an elastic force to keep the spherical housing to stay at an engaged position with respect to the rotation housing, where when an external force is applied to the spherical housing to deform the elastic structure, the spherical housing is escaped from the engaged position and rotatable with respect to the rotation housing until another engaged position is determined by releasing the external force.