Lighting device

A lighting device, comprising:

• a reflector having a central axis and including a proximal edge and a distal edge,
• wherein a circumferential length of the reflector around the central axis at the proximal edge is smaller than a circumferential length of the reflector around the central axis at the distal edge,
• wherein the reflector is made of at least a first piece of a flat material having a first edge and a second piece of the flat material having a second edge,
• wherein the first edge of the first piece is attached to the second edge of the second piece,
• wherein the first edge of the first piece and the second edge of the second piece extend around the central axis, and
• wherein the first and second pieces of the flat material, when resting on a flat surface before being attached to each other, have the following properties:
• a first circle approximating the first edge of the first piece has a first radius,
• a second circle approximating the second edge of the second piece has a second radius, and
• the first radius is smaller than the second radius;
• wherein the second piece of material has a fourth edge opposite to the second edge,
• wherein the fourth edge of the second piece provides the distal edge of the reflector,
• wherein the second piece of material has a seventh edge connecting the second and fourth edges, and an eighth edge connecting the second and fourth edges,
• wherein the seventh edge is attached to the eighth edge when the reflector is formed,
• wherein the seventh edge is releasably attached to the eighth edge, and
• wherein the flat material forming the first and second pieces has a flexural rigidity greater than 1.0×10−3 N·mm and less than 1.0×103 N·mm.