Luminaire provided with a uv lighting module

A luminaire system comprising:

• (i) a luminaire including at least one luminaire solid state light source (configured to emit white light, each luminaire solid state light source being associated with a respective luminaire collimator arranged to collimate said white light into collimated white light, wherein the collimated white light has a main luminaire optical axis which, when said luminaire is mounted in or onto a ceiling, is in the direction of gravity, and a connection slot;
• and
• (ii) a UV lighting module including a connection portion configured to be inserted into said connection slot so as to be releasably attachable to said connection slot, and a light emitting portion housing a module solid state light source configured to generate module light comprising UV light having a dominant peak wavelength in the 280-320 nm range or in the 200-280 nm range and/or 320-380 nm range, and a light window arranged to exit the module light along a main module optical axis;
• wherein said main module optical axis is different from said main luminaire optical axis, and
• wherein the light exit window extends in a vertical plane when the luminaire is mounted in or onto a ceiling.