A skylight cover is provided that includes a light transmitting body including first and second integral lenses. The first and second integral lenses define polygonal perimeters, each polygonal perimeter having a first element and a second element residing therein, the first and second elements disposed adjacent to each other in each instance. The skylight cover may include a plurality of ridges and creases, the individual, respective ridges and creases disposed in advantageous configurations. The cover may likewise include a plurality of surfaces, some optionally parallel and some optionally co-planar.

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.

A daylight redirecting window film having a layered structure with a total thickness of less than one millimeter and having a first optically transmissive film, a second optically transmissive film approximately coextensive with the first optically transmissive film, an intermediate layer of a relatively soft optically transmissive material disposed between the first and second optically transmissive films, a parallel array of linear three-dimensional structures formed in a space between the first and second optically transmissive films, a layer of an optically transmissive adhesive coating a surface of the first optically transmissive film, and a two-dimensional pattern of light scattering surface microstructures formed in an outer surface of the second optically transmissive film. The parallel array of linear three-dimensional structures defines a parallel array of linear channels, and each of the linear three-dimensional structures has a total internal reflection wall extending transversely through a portion of the layered structure.

Technologies and implementations for reflective roofs are generally disclosed.

A skylight shade device includes a skylight having a skylight dome and a shade element. A surface area of the shade element is smaller than the surface area of the skylight dome and positioned generally centrally within the surface area of the skylight dome to occlude at least a portion of high angle sunlight through the skylight dome without occluding low angle sunlight through the skylight dome.

A dimmer mechanism is movable by a motor that is powered by solar-charged supercapacitors between a first configuration, in which the dimmer mechanism blocks little of the interior of a skylight tube to maximize light throughput into a room, and a second configuration, in which the dimmer mechanism blocks more of the interior of a skylight tube to reduce light throughput into the room.

A daylight illumination system for integration into a building or larger vehicle comprises a translucent facade element (800) containing a glass sheet and a light redirection element (302 or 708), and a light transport channel (801) for guiding light about horizontally into an interior of the building, the light transport channel comprising one opening attached to the interior side of said facade element and at least one opening towards the interior of the building, characterised in that the light redirection element (302 or 708) is formed as a structured polymer film or sheet attached to a glass sheet of the facade element (800) and is configured for changing the direction of incident light into the about horizontal light transport channel.

The disclosure presents methods and apparatus of light transmission control, comprising two layers of film separated by air, wherein each film is inlaid with a convex micro-lenses array. The first film will focus incoming light through the microlens, whereas the second film contains a grid of opaque areas that will be structured to block or un-block the focal planes of light depending on the thickness of the air layer. When the light is unblocked, the micro lens array in the second film will disperse the light to the other side of the film so it appears transparent or translucent. An attached hand pump can control the thickness of the air layer. The method and apparatus to control light levels is effective, reliable, affordable, intuitive and easy to use. The films can be attached to existing surfaces provide full transparency, a dimming effect, or complete blackout.

A daylight redirecting window film formed by a flexible multi-layer film laminate with a total thickness of less than one millimeter and configured to be applied to an indoor-facing window surface of a building facade. The window film includes a pair of outer film substrates flanking a light redirecting core layer. The core layer includes a parallel array of channels defining total internal reflection (TIR) surfaces and linear optically transmissive structures protruding transversely thought the core layer and bonded to the outer film substrates. A light output surface of the outer film substrate which is disposed on an indoor-facing side of the laminate includes a two-dimensional pattern of light scattering microstructures which are configured to spread light at least in a plane that is perpendicular to the channels. The TIR surfaces intercept and reflect a portion of sunlight propagating through the core layer such that the window film redirects that portion of incident sunlight towards a plurality of divergent directions, forming relatively high bend angles.

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.