Indirect lighting system for vehicle interior

A vehicle room lamp comprising:

• a room lamp unit, attached to a roof of a cabin, for directly illuminating the cabin, the room lamp unit having a housing of a box shape, the housing having an outer circumference of substantially a round shape, the housing having a fitting piece formed around the outer circumference so as to protrude from the outer circumference, the fitting piece having a cross-section of a hook extending upward;
• and
• an indirect lighting unit indirectly illuminating the cabin, the indirect lighting unit having a housing of a U-shape in plan view corresponding to an outer circumference of the roof containing both lateral side edges and one of a front edge and a rear edge of the roof, the indirect lighting unit having a plurality of light emitting diodes disposed at fixed intervals along an entire inner circumference of the housing of the indirect lighting unit and controlling the light emission of the LEDs such that the LEDs illuminate the roof, the housing of the indirect lighting unit having a support ring located at a center part of the housing of the indirect lighting unit, the support ring having a ring shape corresponding to substantially the entire outer circumference of the housing of the room lamp unit, the support ring having a fitting recess extending along a circumference of the support ring, and the Fitting recess being provided at a portion corresponding to the fitting piece;
• wherein, in mounting the direct lighting unit on the roof, the fitting piece is fitted into the fitting recess to provide downward support for the support ring of the housing of the indirect lighting unit so that the housing of the indirect lighting unit is immovably held between the fitting piece and the roof, and the room lamp unit is secured to the roof so that the indirect lighting unit is also secured to the roof integrally and simultaneously with the room lamp unit, while the support ring of the housing of the indirect lighting unit is simultaneously attached onto the outer circumference of the housing of the room lamp unit;
• and
• wherein the indirect lighting unit directly illuminates a whole area of a roof except an area where the room lamp unit and the indirect lighting unit are disposed, thereby providing an indirect illumination for the cabin with the light reflected by the roof.

A vehicle cabin lamp system comprising:

• a direct lamp unit for directly illuminating the vehicle cabin,
• wherein the direct lamp unit is configured for direct attachment to an interior roof of the vehicle cabin and provide a receiving portion;
• and
• an indirect lighting unit for indirectly illuminating the cabin, the indirect lighting unit having a housing comprising a substantially U-shaped structure configured to provide an attachment portion and to extend around a major portion of a periphery of the interior roof, the periphery of the interior roof comprising two side edges, a front edge, and a rear edge,
• wherein the indirect lighting unit comprises a plurality of light emitting diodes disposed in a predetermined array along an entire inner face to the indirect lighting unit for illuminating substantially all of the interior roof and thereby provide indirect illumination of the vehicle cabin,
• and further wherein the indirect lighting unit is mounted adjacent the interior roof by connecting the attachment portion to the receiving portion of the direct lighting unit.