Luminaire with a connection device

A luminaire comprising:

• a housing with a first end surface, a second end surface, an at least partially circumferential surface extending between said first end surface and said second end surface, a longitudinal direction extending between said first end surface and said second end surface, and
• at least one connection device for connecting said luminaire to a complementary connection device of another corresponding luminaire, said at least one connection device being arranged on either of said first end surface and said second end surface of said luminaire,
• said connection device comprising an electrical connection element extending in an angle γ with respect to said longitudinal direction of said luminaire, said angle being comprised in the interval (0°;
• 90°];
• wherein said connection device further comprises a first surface, wherein said first surface extends in an angle β with respect to said longitudinal direction of said luminaire, said angle β being comprised in the interval 0°<β<90°;
• wherein said connection device further comprises a second surface, said second surface being rounded, and wherein said first surface and said second surface meet in a tip point, the location of the tip point on the connection device satisfying the relation
• y2≧y1*(1−sin β),
• where y1 is the height of the luminaire and y2 is the shortest distance measured in a mounted condition of said luminaire between said tip point and a surface on which the luminaire is mounted.