Lens and illumination device comprising the lens

An illumination device comprising:

• at least one first light source,
• at least one second light source, and
• a lens,
• the lens comprising:
• a bottom wall,
• a top wall, and
• a circumferential wall, the circumferential wall connecting the bottom wall and the top wall,
• wherein a plurality of regions of the bottom wall respectively arch towards the top wall to define at least one first accommodation cavity having an inner wall configured as a first incident surface, and at least one second accommodation cavity having an inner wall configured as a second incident surface, the first incident surface and the second incident surface being configured as different curved surfaces for receiving first incident light and second incident light, respectively,
• wherein the second incident surface is a non-rotationally symmetrical curved surface with respect to a line between a vertex of the second incident surface and a midpoint between both end points of a projection of the second incident surface on the bottom wall, the vertex of the second incident surface, in a cross section, being located on a side, away from the first incident surface, of a midline of a projection of the second incident surface on a horizontal plane, and
• wherein the second incident surface has, in a cross section, a curve profile defined by the formula:
• y=−1E-08x^6+2E-06x^5−0.0001x^4+0.0032x^3−0.0633x^2+1.4584x+1E-06.