Optical element, a lighting system and a luminaire for providing a skylight appearance

A lighting system for use in front of a light source comprising a light emitting surface, the system being configured to obtain a skylight appearance including at least one of a direct sunlight effect or a bluish light emission, said lighting system comprising:

• an optical element including a plate configured to be arranged parallel to the light emitting surface, the plate being opaque and comprising a plurality of holes, the plate further comprising a reflective surface configured to be arranged parallel to the light emitting surface, the reflective surface being light reflective in a predetermined spectral range for obtaining a blue light emission, wherein said optical element further comprises a plurality of collimating means for obtaining a collimated light beam in a specific direction by transmitting a part of the light received from the light source, wherein said part has a light emission angle substantially in the specific direction, each one of the collimating means comprising one of the plurality of holes of the plate;
• and
• a light guide including a light guide surface arranged to receive said collimated light beam, wherein said light guide faces said reflective surface and comprises light outcoupling structures at subareas of said light guide surface that are separate from subareas of the light guide surface through which the collimated light beam is transmitted.