The new "clever" window will replace the sun

Startup SunnyFive company Samsung presented an artificial window with sunlight imitation. It completely copies natural illumination. Developers are assured, that the window will be ordered by those who lives in the bunker in expectation of the next Doomsday.
Transparent glasses replace matte panels. At  the top part of SunnySide are  special lamps recreating a full spectrum of solar beams.
Engineers Samsung assert, that by means of their window the premise becomes cosier, and light will promote vitamin D development in a human body. It is noticed, that the ultraviolet from window lamps does not harm to a skin.