An ophthalmic illumination system includes a light source to emit a light beam and a filter comprising a clear region to transmit visible light in the visible spectrum and a first filtered region to transmit visible light in a first spectral range. The filter is arranged within the optical path of the beam. The system includes a plurality of chromaticity sensors to receive a portion of the light beam transmitted by the filter and output a signal indicating chromaticity of the received beam. The system also includes a processor to receive the signal indicating chromaticity, compare the indicated chromaticity to a target chromaticity stored in memory and, based on the comparison, adjust the chromaticity of the light beam transmitted by the filter by generating a signal to move the filter from a first position in which the light beam is incident upon only the clear region to a second position in which the light beam is partially incident on both the clear region and the first filtered region.

A system intended to be used for lighting purposes of an environment, where a light measurement at a wavelength is performed, is also desired to be monitored, without affecting the measurement performed in a dark environment.

The invention relates to an intelligent variable frequency laser rain, including a back cover, a gluey shell, a radiator and a front cover. A button back cover is arranged at the right end of a button. The button back cover is connected with a master control board. The back cover and the gluey shell are fixedly connected through a plurality of screws. A rubber plug is arranged on the screws. A laser beam is reflected through the lenses and projected onto the grating to form a plurality of laser beams. The stepping motor drives the plastic mirror wheel to rotate so that the laser beams move from top to bottom. When the laser beam reaches the bottom, the laser beam is projected onto the next lens to start the process of the next laser beam from top to bottom, thereby finally realizing a unique visual effect of laser raining.

An apparatus for a theatrical lighting instrument including a light source, which emits light in a light path; a lens located in the light path, and which receives light from the light source and projects light from the light source; a computer memory; and a computer processor. The apparatus may also include first pluralities and second pluralities of cyan, magenta and yellow color filters, each filter including a variable density color filter operated upon by a motor configured to traverse each filter in and out of the light path. Each variable density color filter of the first pluralities of filters may include a high saturation color pallet. Each variable density color filter of the second pluralities of filters may include a low saturation color pallet. The computer memory may include software to multiplex the traversing of the first and the second pluralities of filters to one or more control channels.

The LED and/or laser projection light device has three major project parts including (a) light source (b) image-forming-unit (c) project/refractive lens to make desired enlarge projected image, patterns or light beams. The project light has at least one of inner optics-lens or optics-elements rotating to create the splendid lighted image or patterns or light-beam to emit to outer-cover. Further, The project light preferred have at least one of additional-functions built-in project light device select from (i) 2.sup.nd light source for preferred illumination function(s), (ii) glow, back light, (iii) 2.sup.nd or more project assemblies in one light device, (iv) other light functions, (v) candle light illumination, (vi) bulb illumination, (vii) desk top or floor light illumination, (viii) having battery or rechargeable battery or built-in/outside AC-to-DC circuit to get power source, (ix) apply the USB port or adaptor or connector or AC-plug wire to get power source, (x) steady, rotating, replaceable, detachable, movable 3 major project parts.

The present application discloses an organic light emitting diode assembly. The organic light emitting diode assembly includes a first base substrate; an organic light emitting diode on the first base substrate; and a second base substrate on a side of, the organic light emitting diode distal to the first base substrate. The organic light emitting diode and the second base substrate are spaced apart from each other by a tunable gap. A gap distance of the tunable gap is tunable such that a color of light emitted from the organic light emitting diode assembly is tunable in response to a change in the gap distance.

A multi-color spotlight has a housing having a lens on a first side, a rotational LED mechanism, a knob for actuating the rotational LED mechanism, and a power supply source within the housing operably coupled to the rotational LED mechanism, wherein the rotational LED mechanism comprises a rotatable rod having a plurality of substrates coupled around the circumference thereof, with each substrate being in a distinct geometric plane, each substrate having an LED chip in the center, and wherein only the LED chip that is positioned in the center beneath the lens is configured to receive power from the power supply source.

A luminaire includes an excitation light source which emits excitation light. A first fluorescent plate includes a first principle surface disposed across the optical axis of the excitation light. A first phosphor layer is arranged discretely along the first principle surface. A second fluorescent plate is arranged at the downstream side of the excitation light with respect to the first fluorescent plate. The second fluorescent plate includes a second principle surface disposed across the optical axis. A second phosphor layer is arranged discretely along the second principle surface. The second phosphor layer has a wavelength conversion characteristic different from a wavelength conversion characteristic of the first phosphor layer. A support supports the first fluorescent plate and the second fluorescent plate such that at least one of relative positions and rotations of the first fluorescent plate and the second fluorescent plate are adjustable.

An apparatus for a theatrical lighting instrument including a light source, which emits light in a light path; a lens located in the light path, and which receives light from the light source and projects light from the light source; a computer memory; and a computer processor. The apparatus may also include first pluralities and second pluralities of cyan, magenta and yellow color filters, each filter including a variable density color filter operated upon by a motor configured to traverse each filter in and out of the light path. Each variable density color filter of the first pluralities of filters may include a high saturation color pallet. Each variable density color filter of the second pluralities of filters may include a low saturation color pallet. The computer memory may include software to multiplex the traversing of the first and the second pluralities of filters to one or more control channels.

A filter assembly with a color filter pair for a light fixture comprising two color filters is provided, where the color filters are linear moveable relatively to each other in parallel planes by at least one actuator. Each of the colors filters comprise a color filtering region formed as a comb-like structure comprising plurality of elongated teeth where the elongated teeth of the color filters are angled in relation to the direction of movement of the color filters. Further, the angle between the elongated teeth of the same color filter is less than 10 degrees and the elongated teeth of the two color filters are non-parallel in relation to each other. A light fixture comprising a plurality of such color filter pairs is also described.