Lighting device, window with a lighting function, and building product for a window

A window with a lighting function used as a window of a building or a mobile body, the window comprising:

• a diffuser to receive first light and emit scattered light;
• and
• a frame to support the diffuser, wherein
• the diffuser includes nanoparticles, and guides the received first light, scatters the first light with the nanoparticles, and emits the first light as the scattered light,
• the diffuser includes a light incident surface to receive the first light, a first surface on which a first light emission surface to emit the scattered light is formed, and a second surface opposite the first surface,
• the light incident surface is formed at a first edge portion of the diffuser,
• the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the first light emission surface is formed and a region on the second surface corresponding thereto, and
• a correlated color temperature of the scattered light is higher than a correlated color temperature of the first light.

A building product for a window comprising:

• a first light source to emit first light;
• a diffuser to receive the first light and emit scattered light;
• and
• a frame to support the first light source and the diffuser, wherein
• the diffuser includes nanoparticles, and guides the received first light, scatters the first light with the nanoparticles, and emits the first light as the scattered light,
• the diffuser includes a light incident surface to receive the first light, a first surface on which a first light emission surface to emit the scattered light is formed, and a second surface opposite the first surface,
• the light incident surface is formed at a first edge portion of the diffuser,
• the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the first light emission surface is formed and a region on the second surface corresponding thereto, and
• a correlated color temperature of the scattered light is higher than a correlated color temperature of the first light.