A lamp projecting a starry sky is provided. The lamp projecting the starry sky includes at least one beam generator, an interference filter configured to produce nebula effect, a reflecting mirror, and at least one first lens, the at least one beam generator is placed on a first side of the interference filter, the reflecting mirror is placed on a second side of the interference filter, the at least one first lens is located on an emergent light path of the interference filter; a light beam emitted from the interference filter forms a moving and layering nebula projection after passing through the at least one first lens. In the lamp, after multiple refractions, reflection and refraction, the light beam is magnified by the lens.

A cycloidal diffractive waveplate based star simulator generates a star field with very high precision star locations and accurate brightness. The present disclosure provides a star simulator that allows for a large FOV, modular, multi-star simulator capable of very high precision dynamic star locations for testing of high accuracy, large FOV star trackers. The system is composed of a light source, a polarization grating-based image [1], and an opto-mechanical system for steering the light. The light is projected onto a diffuse screen where the light is scattered, creating a functional point source at the screen. A star tracker or other device under test views the screen which has a multitude of projected spots (each with its own light source and beam steering device) positioned in a star field distribution appropriate for the simulated viewing direction.

The present disclosure is directed to projection devices that can project patterned light of different colors. In one implementation, the projection device can include a housing, within which reside multiple components. These components can include light emitting diodes (LEDs), a parabolic mirror reflector, a sinusoidal lenticular diffuser, and multiple spatial filters. The multiple LEDs can be provided in at least two distinct colors. The parabolic mirror reflector can be arranged to collimate light received from the multiple LEDs. The sinusoidal lenticular diffuser can be positioned at an output of the parabolic mirror reflector and arranged to diffuse the collimated light. The spatial filters can be arranged to diffuse the diffused and collimated light received from the sinusoidal lenticular diffuser. An imaging lens can be coupled to the housing and arranged to magnify the diffused light received from the spatial filters and display a cloud-like effect on a first surface.

A camp lantern includes a housing having an outer wall, a lower surface, and an upper surface with an LED module positioned thereon. A U-shaped handle attached to opposing sides of the outer wall allows the lantern to be easily transported to remote locations. Removably superimposable on the LED module is a frosted, semispherical cover that allows the lantern to be used as a portable light source. Any one of a plurality of interchangeable, substantially opaque covers with transparent, thematic design elements can be substituted for the frosted cover to convert the camping lantern to an image projector. When the LED module is activated, light only passes through the transparent portions to project the design elements onto a tent or cabin ceiling.

A lamp projecting a starry sky is provided. The lamp projecting the starry sky includes at least one beam generator, a reflecting member with uneven and irregular reflecting surface, a first motor, and at least one first lens. The first motor is connected to the reflecting member through a connecting shaft, the reflecting member is driven to rotate when the first motor rotates, a light beam generated by the beam generator irradiates onto a first side of the reflecting member along an incident light path, and a light beam emitted from the reflecting member forms a moving and layering nebula projection after passing through the at least one first lens. In the lamp, after passing from the reflecting member, the light beam is magnified by the lens, so that the generated starry sky will not be too bright and dazzling, which effectively enhances the layering sense of the starry sky.

The present utility model discloses a projection lamp capable of simultaneously achieving multiple effects. The projection lamp includes a housing formed by connecting an upper housing and a lower housing, wherein a first projection module, a second projection module and a third projection module are arranged in the housing; the first projection module includes a first rotating motor, an LED lamp panel, a rotating disc, a plurality of small lenses and a first transparent sheet; the first rotating motor is arranged at the bottom of the LED lamp panel; one end of a rotating shaft of the first rotating motor extends out of the LED lamp panel; the plurality of small lenses are arranged in the rotating disc; the rotating disc and the first transparent sheet are connected to one end of the rotating shaft in a penetrating mode; a continuous irregular concave-convex surface is arranged on the surface of the first transparent sheet; the first projection module is used for forming the effect of mist and clouds floating in the starry sky; the second projection module is used for forming the effect of twinkling stars; and the third projection module is used for forming the effect of different shapes of quasi-nebulae or clouds.

The light projector includes a housing and an upper cover which form a containing cavity; a light-emitting component, a laser lamp component, a main control board, a speaker and a cavity bracket are all arranged within the cavity. The cavity bracket is provided with a motor fixing groove and a limiting wall, the light-emitting component is arranged in the limiting wall, a motor is placed on the motor fixing groove and is fixed through a fixing lug, a refracting surface of an optical lens is formed by a plurality of curved striped prisms. An aurora sheet is rotated by the drive component, light from the light emitting lamp shining through the aurora sheet and projected by the refracting surface of the optical lens to form a dynamic aurora pattern. The laser lamp component is configured to project an illumination pattern simulating.

A projection device includes a first light-emitting component, a second light-emitting component and a housing. The first light-emitting component and the second light-emitting component are fixed to the housing. A first outer surface of the housing is provided with a first light outlet and a second light outlet; the first light-emitting component is arranged corresponding to the first light outlet; the second light-emitting component is arranged corresponding to the second light outlet; and the first light outlet has a larger area than the second light outlet, such that a projection range of the second light-emitting component is within that of the first light-emitting component. The disclosure can avoid the defect of a single effect of a lamp cap of a projection lamp in the scope of the prior art.

Disclosed is a light effect projection device, including a control unit, a condensing diffraction assembly and a first lamp source, wherein the first lamp source and the control unit are both fixed in a housing, the first lamp source is electrically connected to the control unit, the condensing diffraction assembly is located above the first lamp source, the condensing diffraction assembly at least includes a plastic condensing lens, the condensing lens is shaped like a spherical crown or a semi-sphere, an incident plane of the condensing lens is concave, and the incident plane or an emergent plane of the condensing lens is of a polyhedral structure; further including a driving unit which is fixedly arranged in the housing and electrically connected to the control unit, wherein one part of the condensing diffraction assembly is fixed at a power output end of the driving unit for driving connection.

A system and method for creating a trompe-l'oeil skylight in a ceiling where a light emitting image of the sky is provided in a structure configured to emulate a skylight frame, including an embodiment of a unified non-rectangular sky image area in a substantially rectangular fixture which mount as a single unit into a substantially rectangular hole in a ceiling.