A tubular skylight assembly. The tubular skylight assembly may include a light tube pitch adapter that may be adjustable to alter an angle between its ends, a cylindrical light tube secured to the light tube pitch adaptor, a collar for securing to the light tube pitch adapter, a flashing surround preferably having an exterior base and a top cover, and a skylight cover having an outer frame and a glass pane. The collar and light tube pitch adapter may reside at least partially within the exterior base of the flashing surround and the skylight cover may be disposed over the top cover of the flashing surround.

A sunlight redirector has a first mirror array formed of a first plurality of substantially parallel, uniformly spaced, longitudinal outward mirror segments; and a second mirror array formed of a second plurality of substantially parallel, uniformly spaced, longitudinal inward mirror segments. Each mirror segment has a normal vector. The outward mirror segments are adjustably positionable, such that their normal vectors remain parallel. The first mirror array is rotatable about a normal vector of the sunlight redirector. The inward mirror segments may remain fixed in position at all times; or they may be moved, twice per day, between first and second fixed positions.

An indirect light skydome with natural ventilation for building roofs consists a half sphere dome with a curved brim (101) and an air vent (102) around the dome (100), which attached to the horizontal circular base (.sub.6) with a fan shape opening to allow only indirect sunlight and connected to the tube for light transmission inside the building. The dome (100) is divided into transparent part (1) for receiving only indirect light and opaque part (2) for direct light protection, which are made into a single dome using a coating technique to prevent rainwater leakage in the joints. The shading part and the fan shape opening correspond to the sun's angle for effective direct light protection during the daytime and all year round. The air vent (102) is designed for effective air flow for stack and cross ventilation in all directions. The indirect light skydome with natural ventilation helps to reduce heat and increase quality of daylight.

An indirect light skydome with natural ventilation for building roofs consists a half sphere dome with a curved brim (101) and an air vent (102) around the dome (100), which attached to the horizontal circular base (.sub.6) with a fan shape opening to allow only indirect sunlight and connected to the tube for light transmission inside the building. The dome (100) is divided into transparent part (1) for receiving only indirect light and opaque part (2) for direct light protection, which are made into a single dome using a coating technique to prevent rainwater leakage in the joints. The shading part and the fan shape opening correspond to the sun's angle for effective direct light protection during the daytime and all year round. The air vent (102) is designed for effective air flow for stack and cross ventilation in all directions. The indirect light skydome with natural ventilation helps to reduce heat and increase quality of daylight.

A tubular skylight assembly. The tubular skylight assembly may include a light tube pitch adapter that may be adjustable to alter an angle between its ends, a cylindrical light tube secured to the light tube pitch adaptor, a collar for securing to the light tube pitch adapter, a flashing surround preferably having an exterior base and a top cover, and a skylight cover having an outer frame and a glass pane. The collar and light tube pitch adapter may reside at least partially within the exterior base of the flashing surround and the skylight cover may be disposed over the top cover of the flashing surround.

A lighting system to simulate a window open to the sky and comprising an optical system including: a visible optical source, which emits visible optical radiation; and a chromatic optical device, which includes a diffusion region and defines a first emission surface arranged downstream of the diffusion region. The chromatic device receives the visible optical radiation and generates, on the first emission surface, a visible output beam, which has an angular luminance profile that exhibits a peak with FWHM below 20 in two planes, mutually orthogonal and containing the direction of maximum luminance. In each point of the first emission surface, the visible output beam comprises a direct component, emitted in the direction of the luminance peak, and a diffuse component emitted at angles that differ by more than 40 from the direction of the direct component. The CCT of the diffuse component is at least 1.2 times higher than the CCT of the direct component. The lighting system also includes an infrared source, which defines a second emission surface and emits, downstream of the second emission surface, an infrared output beam substantially without visible components.

A lighting system to simulate a window open to the sky and comprising an optical system including: a visible optical source, which emits visible optical radiation; and a chromatic optical device, which includes a diffusion region and defines a first emission surface arranged downstream of the diffusion region. The chromatic device receives the visible optical radiation and generates, on the first emission surface, a visible output beam, which has an angular luminance profile that exhibits a peak with FWHM below 20 in two planes, mutually orthogonal and containing the direction of maximum luminance. In each point of the first emission surface, the visible output beam comprises a direct component, emitted in the direction of the luminance peak, and a diffuse component emitted at angles that differ by more than 40 from the direction of the direct component. The CCT of the diffuse component is at least 1.2 times higher than the CCT of the direct component. The lighting system also includes an infrared source, which defines a second emission surface and emits, downstream of the second emission surface, an infrared output beam substantially without visible components.

Disclosed is a system and method for harvesting solar energy, and more particularly an energy-positive sky lighting system that may provide an integrated energy solution to a variety of commercial buildings. A plurality of skylight modules are provided, each having a plurality of louvers configured to reflect incoming sunlight onto a receiver tube assembly on an adjacent louver to heat a working fluid in communication with the louvers (i.e., such that heat transfer is carried out between the thermal receiver and the working fluid), all while allowing control of the amount of daylight that passes through the module. The modules are constructed such that the balance of the solar energy not going into day lighting is captured in the form of thermal heat, which in turn may be applied to building system cooling and heating applications.