A light shading element includes a base plate having a light-transmitting hole, a light shading blade for at least partially blocking the light-transmitting hole, and first and second driving mechanisms pivotally connected to the light shading blade to drive its movement in a plane. The first and second driving mechanisms are pivotally connected to the light shading blade through a first pivot point and a second pivot point, respectively. The light shading blade is configured to selectively move close to and away from the light-transmitting hole to respectively block and unblock the light-transmitting hole. The first pivot point moves along an arcuate trajectory under driving of the first driving mechanism, and the second pivot point is capable of moving along another arcuate trajectory around the first pivot point under driving of the second driving mechanism, when the first pivot point is at any position along the arcuate trajectory.

A lighting device includes a base configured to be attachable to a support structure. A light housing is coupled to the base and is configured to be engageable with a light source to illuminate a light beam along an illumination axis. The light housing is attached to the base in a manner which allows the light housing to be moveable relative to the base. A beam modifying device is configured to be selectively attachable to the light housing in optical alignment with the light source. The light housing is configured such that movement of the light housing relative to the base facilitates adjustment of the position of an illuminated area. The beam modifying device is configured such that attachment of the beam modifying device to the light housing facilitates adjustment of the size of the illuminated area.