WO2023079516A1

WO2023079516A1 - Light fixture and method for operating said light fixture

Info

Publication number: WO2023079516A1
Application number: PCT/IB2022/060677
Authority: WO
Inventors: Alberto Alfier; Aris QUADRI; Renato Frison; Marco Angelini; Davide FERRATI
Original assignee: Clay Paky S.P.A.
Priority date: 2021-11-08
Filing date: 2022-11-07
Publication date: 2023-05-11

Abstract

A light fixture (1), preferably a stage light fixture, comprising at least one light module (4) provided with: at least two source assemblies (15); each source assembly including at least two light sources (21) configured to emit light beams having different light emission spectra (RGBW); a mixing assembly (13) comprising at least two mixing devices (16), each of which is arranged along a respective longitudinal axis (B1, B2), is provided with an input (22) and an output (23) and is configured to mix the light radiation emitted by a respective source assembly (15) and passing through the input (22) and to emit a mixed light beam at the output (23); an output optical assembly (18) provided with an optical axis (O) and arranged downstream of the at least two mixing devices (16) for intercepting the light beams exiting the at least two mixing devices (16); one of the output optical assembly (18) and the mixing assembly (13) being movable along the optical axis (O) between a first operating position, wherein the output optical assembly (18) is proximal to the output (23) of the mixing devices (16), and a second operating position, wherein the output optical assembly (18) is distal to the output (23) of the mixing devices (16).

Description

"LIGHT FIXTURE AND METHOD FOR OPERATING SAID LIGHT FIXTURE"

Cross-Reference to Related Applications

This patent appl ication is related to Italian Patent Application No . 102021000028376 filed on November 8 , 2021 , the entire disclosure of which is incorporated herein by reference .

Technical Field

The present invention relates to a light fixture and a method for operating said light fixture .

In particular, the present invention relates to a l ight fixture , preferably a stage light f ixture of the multi-source type .

Background

In the field of stage lighting, there is an increasing need to implement innovative and striking stage ef fects .

In addition, in recent years , most of the ef forts have been concentrated in the field of multi-source , preferably LED, light fixtures .

In the field of multi-source light fixtures , however, particular importance is usually given to the observer' s perception of the light fixture . Therefore , stage ef fects often involve animations that are visible when looking at the light fixture from the front . Less attention is paid to stage ef fects caused by proj ections of beams generated by light sources of multi-source light fixtures .

Summary

It is therefore an obj ect of the present invention to provide a light fixture capable of generating new stage ef fects not only linked to the observer' s perception of the light fixture , but also to the proj ections of the generated beams . It is also an obj ect of the present invention to provide an innovative light fixture compared to the existing ones , which is functionally and constructively simple and, at the same time , inexpensive .

In accordance with these obj ects , the present invention relates to a light fixture , preferably a stage light fixture , comprising at least one light module provided with :

• at least two source assemblies ; each source assembly including at least two light sources configured to emit light beams having di f ferent light emission spectra ;

• a mixing assembly, comprising at least two mixing devices , each of which is arranged along a respective longitudinal axis , is provided with an input and an output and is configured to mix the light radiation emitted by a respective source assembly and passing through the input and to emit a mixed light beam at the output ;

• an output optical assembly provided with an optical axis and arranged downstream of the at least two mixing devices for intercepting the light beams exiting the at least two mixing devices ;

• one of the output optical assembly and the mixing assembly being movable along the optical axis between a first operating position, wherein the output optical assembly is proximal to the output of the mixing devices , and a second operating position, wherein the output optical assembly is distal to the output of the mixing devices .

The structure of the light fixture according to the present invention allows the creation of several innovative stage ef fects . The movement of the output optical assembly between the first position and the second position results in variation in the stage ef fects that can be achieved .

In particular, the structure of the light module of the light fixture according to the present invention makes it possible to have di f ferent ef fects in the first and second positions , both on the observer' s perception of the light fixture and on the proj ection of the generated beams .

It is a further obj ect of the invention to provide a method for operating a light fixture , which is capable of obtaining new and striking stage ef fects .

In accordance with these obj ects , the present invention relates to a method for operating a light fixture as claimed in claim 17 .

Brief Description of the Drawings

Further features and advantages of the present invention will be apparent from the following description of a non-limiting embodiment thereof , with reference to the figures of the accompanying drawings , wherein :

- Figure 1 is a perspective view of a light fixture in accordance with an embodiment of the present invention;

- Figure 2 is an exploded perspective view, with parts removed for clarity, of a light module of the light fixture in Figure 1 ;

- Figure 3A is a side view, with parts removed for clarity, of the light module in Figure 2 in a first operating position;

- Figure 3B is a diagram showing the light distribution ( illuminance ) over a surface positioned at a certain distance from the light module in Figure 2 in the first operating position;

- Figure 3C is a front view of the light module in Figure 2 ;

- Figure 4A is a side view, with parts removed for clarity, of the light module in Figure 2 in a second operating position; - Figure 4B is a diagram showing the light distribution ( illuminance ) over a surface positioned at a certain distance from the light module in Figure 2 in the second operating position;

- Figure 4C is an image illustrating the proj ection of the light beam emitted by the light module in Figure 2 in the second operating position;

- Figure 5 is a front view of a detail of the light fixture in Figure 1 ;

- Figures 6A, 6B, 6C are exemplary images of the beam proj ected by the light fixture according to the present invention in di f ferent operating configurations .

Description of Embodiments

In Figure 1 , reference number 1 indicates a stage light fixture comprising a housing 2 , support means 3 , configured to support and move the housing 2 , and a plurality of light modules 4 .

The housing 2 extends along a longitudinal axis A and has a first , closed end 7 and a second end 8 , opposite the first closed end 7 along the axis A, and provided with a proj ection port 9 . In the non-limiting example described and illustrated herein, the proj ection port 9 has a substantially circular cross-section and defines a circle-shaped proj ection area .

The support means 3 are configured to allow the housing 2 to rotate around two orthogonal axes , commonly referred to as PAN and TILT . In particular, the support means 3 comprise a base 11 coupled to a clevis 12 which can rotate around the PAN axis . The clevis 12 supports the housing 2 so that it can rotate around the TILT axis .

The actuation of the support means 3 is regulated by a control device (not visible in the attached figures ) . The control device can also be managed remotely, preferably via DMX protocol communications . The plurality of light modules 4 is housed in the housing 2 .

The light modules 4 , as we will see in more detail later, are arranged side-by-side to define an emission surface of the light fixture 1 .

The light modules are substantially identical in structure and di f fer from one another in functionally insigni ficant geometrical parameters .

Therefore , in the following we will describe , for the sake of simplicity, a light module 4 .

With reference to Figure 2 , each light module 4 comprises at least two source assemblies 15 which emit respective light beams along an emission direction E , a mixing assembly 13 comprising at least two mixing devices 16 , each of which is associated with a respective source assembly 15 and i s configured to mix the light beams emitted by the respective source assembly 15 , and an output optical assembly 18 arranged, relative to the direction E , downstream of the at least two mixing devices 16 for intercepting the light beams exiting the at least two mixing devices 16 .

With reference to Figures 2 and 3 , the source assemblies 15 are arranged side-by-side and preferably not aligned .

"Not aligned" means that no side of a source assembly 15 is aligned with a side of the adj acent source assembly 15 .

The distance between the source assemblies 15 may di f fer from that shown in the non-limiting example in the attached figures and substantially depends on the si ze of the output optical assembly 18 and on the layout of any additional light modules 4 of the light fixture 1 .

One variant , not shown, provides that each light module 4 comprises more than two source assemblies , for example , arranged of fset .

Each source assembly 15 comprises a substrate 20 and at least two light sources 21 coupled to the substrate 20 and configured to emit light beams having di f ferent light emission spectra .

In the non-limiting example described and illustrated herein, the light sources 21 are defined by LEDs ( LIGHT EMITTING DIODEs ) .

Preferably, the light sources 21 are four and of the RGBW (Red Green Blue White ) type and are arranged in a matrix format .

It is understood that the number, layout , and emission spectrum of the l ight sources 21 may be di fferent from those described and represented above .

For example , one variant provides that the light sources in each source as sembly are three , of the RGB type , and not arranged in a matrix format .

The source assemblies 15 are integrated into one or more electronic boards (not shown for simplicity) and are supported by a support plate 28 , which is coupled to a support structure (not visible in the attached figures ) integral with the housing 2 . Preferably, the support plate 28 is arranged orthogonal to the axis A of the housing 2 .

The source assemblies 15 can be independently controlled by the control device ( not shown in the attached figures ) . Preferably, the individual light sources 21 of each source assembly 15 can also be independently controlled by the control device .

In this way, as we will see in more detail later, it is possible to adj ust the activation and intensity of the individual light sources in order to achieve multiple stage ef fects .

With reference to Figure 2 , each mixing device 16 is provided with an input 22 and an output 23 and is configured to mix the light radiation passing through the input 22 and to emit a mixed light beam at the output 23 .

Each mixing device 16 extends along a respective longitudinal axis Bl , B2 .

The input 22 , in use , is arranged proximal to the source assembly 15 , whereas the output 23 is arranged distal to the source assembly 15 .

Preferably, the source assembly 15 and the respective mixing device 16 are arranged coaxially .

In the non-limiting example described and illustrated herein, each mixing device 16 comprises an optical body 24 and a support body 25 configured to support the optical body 24 .

In the non-limiting example described and illustrated herein, the optical bodies 24 of the mixers 16 are substantially identical .

According to variants , not shown, the optical bodies 24 may have di f ferent structures and/or dimensions and/or may be provided with di f ferent additional optical elements .

The optical body 24 is an elongated body extending along the respective longitudinal axis Bl , B2 and has a shape comprising at least one portion with a non-cylindrical symmetry .

For example , the optical body 24 may have a prismatic shape or a shape comprising one or more prismatic portions ( even of di f ferent shapes ) , or a shape comprising one or more prismatic portions and one or more cylindrical portions .

The prismatic shape may have a polygonal base varying depending on the application . In the non-limiting example described and illustrated herein, the optical body 24 is a square-based prism . Variations include rectangular- , pentagonal- , star-based prisms , etc .

The optical body 24 can be a solid body (usually referred to as "rod" in technical j argon) or a hollow body (usually referred to as " light tunnel" in technical j argon) .

In the example described and illustrated herein, the optical body 24 is a solid body .

Preferably, the optical body 24 has an increasing crosssection starting from a first end 26 arranged, in use , at the input 22 to a second end 27 arranged, in use , at the output 23 .

According to a variant , not shown, the optical body can have a constant cross-section . The support body 25 is a hollow body provided with a through channel 30 , within which the optical body 24 is , at least in part , housed .

The through channel 30 preferably has a shape complementary to the shape of the optical body 24 .

In the non-limiting example described and illustrated herein, the end 26 of the optical body 24 is external to the through channel 30 .

The support body 25 can be attached to a support structure (not visible in the attached figures ) integral with the housing 2 .

In particular, the support body 25 is configured to support the optical body 24 so that the end 26 is arranged at a distance from the respective source assembly 15 such that at least a portion of the light beam strikes the optical body 24 . In particular, the end 26 is arranged such that the portion of the beam striking the optical body 24 is greater than 60% of the total beam .

Preferably, the mixing device 16 also includes an optical end element 32 arranged at the end 27 of the optical body 24 to intercept the beam exiting the optical body 24. Preferably, the optical end element 32 is supported by the support body 25.

Preferably, the support body 25 is configured to support the optical end element 32 at one output of the through channel 30.

The optical end element 32 may be, for example, a diffuser element, a lens having a surface treated to have a diffusive effect, a diffuser element coupled to a lens, etc.

In accordance with a variant, not shown, at the end 27 the optical body 24 exhibits a beam-exit surface, which has diffusive properties. In this case, the optical end element 32 is not present.

According to a variant, not shown, the light module 4 comprises a single optical end element configured to intercept the beam exiting the at least two optical bodies 24 of the mixing elements 16.

According to a variant, not shown, the optical body 24 at the end 26 has a beam entrance surface which is spoked and/or polygonal, e.g., concave or convex.

Alternatively, in accordance with a further variant, the end 26 is coupled to a concave or convex lens and arranged to intercept the beam entering the optical body 24.

The optical body 24 is made of a material transparent to the light rays and capable of achieving the refraction of the light beam striking the inner faces of the side walls of the optical body 24.

In other words, the rays of the light beam emitted by the source assembly 15 which strike the end 26 of the optical body 24 can pass through the optical body 24 and exit at the end 27 if they have a direction such as not to strike the inner faces of the side walls ( i . e . , directions close to the axial direction) , whereas , in the opposite case , they are reflected on the inner faces of the side walls of the optical body 24 .

Preferably, the optical body 24 is made of glass . According to variants , the optical body can be made of high- power glass or low-power polymer material ( e . g . , PMMA, silicone , PMMI , polycarbonate , ... ) .

One variant , not shown, provides that the inner walls of the through channel 30 of the support body 25 are coated with a reflective material and that the optical body is not present . In other words , the rays of the light beam entering one end of the through channel 30 are reflected by the inner walls of the through channel 30 and conveyed towards the opposite end .

In the non-limiting example described and illustrated herein, the support body 25 of a mixing device 16 i s made in one piece with the support body 25 of the adj acent mixing device 16 .

In other words , the support bodies 25 of the at least two mixing devices 16 are made and coupled together so as to generate a single support body .

Basically, the support bodies 25 of the at least two mixing devices 16 are defined by a single body provided with at least two through channels 30 .

The body can be made into multiple parts to allow the positioning of the optical bodies 24 . The parts can then be coupled together, for example by mechanical interference or ultrasonic welding, or in accordance with other coupling methods .

The output optical assembly 18 is arranged downstream of the at least two mixing devices for intercepting at least part of the light beams exiting the at least two mixing devices .

In particular, in the configuration described and illustrated herein, the output optical assembly 18 is arranged downstream of the at least two mixing devices for intercepting most of the light beams exiting the at least two mixing devices .

The output optical assembly 18 is supported by a frame 29 (visible in Figure 5 and not shown for simplicity in Figures 2-4 ) .

The term "optical assembly" refers to an element which is active from an optical point of view and capable of causing a change in the inclination of the light rays striking the surface of the optical element .

The term "output" is intended to mean that the optical assembly 18 is the last optical assembly to intercept , at least in part , the light beam produced by the respective source assemblies 15 .

The output optical assembly 18 may include a lens and/or a lens assembly and/or a mirror assembly .

In the non-limiting example described and illustrated herein, the optical assembly 18 is defined by a lens , preferably a plano-convex lens .

In the non-limiting example described and illustrated herein, the optical assembly 18 is at least partly transparent , so that some internal parts ( speci fically the outputs 23 of the mixing devices 16 ) are visible from the outside of the light fixture 1 .

The output optical assembly 18 has an optical axis 0.

Preferably, the output optical assembly 18 is arranged so that the optical axis 0 coincides with an extens ion axis Bl , B2 of one of the at least two mixing devices 16 . In other words , only one mixing device 16 is arranged coaxially with the output optical assembly 18 , whereas the other mixing device ( s ) 16 is/are not coaxial with the output optical assembly 18 . In this way, the beam emitted by the mixing device 16 arranged coaxially with the optical assembly propagates axially, whereas the beam emitted by the mixing device 16 arranged non-coaxially propagates non-axially ( e . g . , inclined) , giving rise to a very particular stage ef fect which is better visible in Figure 4c .

In accordance with a variant , not shown, the optical assembly is neither coaxial with any of the mixing devices nor coaxial with the axis of symmetry of the mixing devices 16 . In other words , in this case , the optical assembly is not centred on any of the mixing devices , nor is it centred on the mixing assembly .

The light module 4 is configured so that one of the output optical assembly 18 and the at least two mixing devices is movable along the optical axis 0 between a first operating position wherein the optical assembly 18 is arranged proximal to the output 23 of the mixing devices 16 ( Figure 3A) and a second operating position wherein the optical assembly 18 is arranged distal to the output 23 of the mixing devices 16 ( Figure 4A) .

In the non-limiting example described and illustrated herein, it is the output optical assembly 18 that i s movable . In particular, the frame 29 is moved by an actuator device (not shown in the attached figures ) between the first operating position and the second operating position .

The actuation o f the actuator is regulated by the control device (not visible in the attached figures ) . The control device can also be managed remotely, preferably via DMX protocol communications . In the first position (Figure 3A) , the beams exiting the mixing devices 16 strike the output optical assembly 18 and substantially produce two stage effects.

A first stage effect is the projection of a single beam (visible in Figure 3B) defined by the superposition of the beams emitted by the two mixing devices 16.

A second stage effect is the distinct visibility of the output 23 of the mixing devices 16 when the observer looks at the light fixture 1 (see Figures 3c and 5) .

Advantageously, in the first position, the separate switching on of the source assemblies 15 and/or the change in the colouring of the source assemblies 15 can give rise to a new stage effect, i.e., a light flickering that gives the observer a very bright glittering sensation. In other words, the switch-on and switch-off timing of each source assembly 15 is differentiated from that of the other source assembly 15 so that the switching on and switching off of each source assembly 15 are independent in time. This allows different effects to be achieved with selectively offset or synchronized switching on/off depending on the stage needs.

These effects can have a major scenic impact.

The same differentiated switching on of the source assemblies 15 and/or the change in the colouring of the source assemblies 15 generates, in the first position, a projected light beam having shape, intensity and colour that change at very high speed without the need for processing the beam by means of other mechanically operated instruments (movement of lenses, diaphragms, etc.) .

The differentiated switching on of the source assemblies 15 enables, for example, the beam angle to be varied in a very short time.

In the second position (Figure 4A) , the beams exiting the mixing devices 16 strike the output optical assembly 18 and substantially produce two stage effects.

A first stage effect is the projection of two separate beams (visible in Figures 4B and 4C) , which are substantially identical in shape to the cross-section of the output 23 of the mixing device 16 (square in the example described and illustrated herein) .

A second stage effect is the visibility of an even colour of the output optical assembly 18 (with the individual mixing devices 16 not visible) when the observer looks at the light fixture 1.

Advantageously, in the second position, the independent adjustment of the source assemblies 15 (e.g., the differentiated switching on of the source assemblies 15 and/or the change in the colouring of the source assemblies 15) can give rise to new stage effects: the generation of separate beams having colour and intensity that change independently to create projection light effects or the differentiated projection of separate beams emitted by the optical assembly 18. As mentioned above, the differentiated switching on can be performed very quickly and at high frequency since it is linked to controlling the switching on of source assemblies 15 and not to moving components of the light fixture. The stage effect on the projection of the generated beams is even more striking in an environment where there is smoke (e.g., generated by a smoke machine) . In fact, in a smoky environment, not only the projections but also the light beams emitted by the light fixture 1 will be visible .

Figure 5 shows a front view of the light fixture 1, in which all the light modules 4 can be seen arranged side-by- side. From the view in Figure 5 it is clear that the geometrical parameters of the individual light modules 4 are variable .

For example , the shape of the output optical assembl ies 18 is variable , as are the layouts of the mixing devices 16 .

Preferably, the source assemblies 15 ( and accordingly the respective mixing devices 16 ) are centred on distinct and radial directions , respectively, relative to the axis A and tangentially mutually of fset . Figure 5 shows the radial directions with dash-dotted lines and the circumferential directions with dashed lines .

Preferably, there is only one frame 29 for supporting the output optical assemblies 18 . This implies that the movement of the output optical assemblies 18 between the first position and the second position is synchronous for all the light modules 4 .

It is understood that solutions can be adopted which allow independent movement of the output optical assemblies 18 of the plurality of light modules 4 . This enables di f ferentiated movement of the optical assemblies 18 to achieve innovative stage ef fects .

In the non-limiting example described and illustrated herein, the frame 29 can also rotate in a plane orthogonal to the axis A of the light fixture 1 .

In use , therefore , the transition of the output optical assemblies 18 from the first operating position to the second operating position, and vice versa, results in a change in the achievable stage ef fects . The independent control of the source assemblies 15 , on the other hand, results in a change in the stage ef fects that can be achieved in the respective operating positions .

The remote and independent control of the position of the output optical assemblies 18 and of the source assemblies 15 therefore allows for a variety of innovative stage ef fects . In addition, the transition from one stage ef fect to another is quick and does not require the implementation of dedicated mechanical solutions , which are costly in economic terms and bulky in terms of the overall dimensions of the light fixture 1 .

The sequence in Figures 6A, 6B, 6C shows beams obtained by means of the light fixture 1 according to the present invention, in which more than one light module 4 is active .

Speci fically, the ef fects in Figures 6A, 6B, 6C are obtained with the optical assemblies 18 of all the light modules 4 in the second operating position .

Figure 6A shows an example of a light beam obtained from the light fixture 1 , in which the source assemblies 15 illuminating the mixing device 16 coaxial with the optical assembly 18 are all switched on, whereas the source assemblies 15 illuminating the mixing device 16 not coaxial with the optical assembly 18 are all switched of f .

The ef fect is a tubular beam .

Figure 6B shows an example of a light beam obtained from the light fixture 1 , in which some of the source assemblies 15 illuminating the mixing device 16 coaxial with the optical assembly 18 are switched on, and some of the source assemblies 15 illuminating the mixing device 16 not coaxial with the optical assembly 18 are switched on .

The ef fect is the coexistence of a central beam and a light cone surrounding the central beam .

Figure 6C shows an example of a light beam obtained from the light fixture 1 , in which the source assemblies 15 illuminating the mixing device 16 coaxial with the optical assembly 18 are all switched of f , whereas the source assemblies 15 illuminating the mixing device 16 not coaxial with the optical assembly 18 are all switched on . The ef fect is the creation of an empty light cone .

The transition between the configurations shown in Figures 6A, 6B, 6C can be carried out substantially immediately ( a few milliseconds ) because it is the result of an electronic modulation of the source assemblies 15 . This allows the generation of multiple , heretofore unseen light ef fects .

Lastly, due to the special structure of the l ight modules 4 , the ef ficiency of the light fixture 1 according to the present invention is increased compared to the ef ficiency of the known light fixtures .

With the same power and si ze of the proj ection area, in fact , the presence of two source assemblies 15 per optical assembly 18 allows for single-colour beams of primary colours with twice the brightness compared to those achievable with the prior art light fixtures .

In the case of single-colour beams of secondary colours ( obtained by mixing several colours ) , the brightnes s is still greater than that achievable with light fixtures of the same si ze and power .

Lastly, it is clear that modifications and variations may be made to the light fixture and method described herein without departing from the scope of the appended claims .

Claims

1. A light fixture (1) , preferably a stage light fixture, comprising at least one light module (4) provided with :

• at least two source assemblies (15) ; each source assembly including at least two light sources (21) configured to emit light beams having different light emission spectra (RGBW) ;

• a mixing assembly (13) comprising at least two mixing devices (16) , each of which is arranged along a respective longitudinal axis (Bl, B2) , is provided with an input (22) and an output (23) and is configured to mix the light radiation emitted by a respective source assembly (15) and passing through the input (22) and to emit a mixed light beam at the output (23) ;

• an output optical assembly (18) provided with an optical axis (0) and arranged downstream of the at least two mixing devices (16) for intercepting the light beams exiting the at least two mixing devices (16) ;

• one of the output optical assembly (18) and the mixing assembly (13) being movable along the optical axis (0) between a first operating position, wherein the output optical assembly (18) is proximal to the output (23) of the mixing devices (16) , and a second operating position, wherein the output optical assembly (18) is distal to the output (23) of the mixing devices (16) .

2. The light fixture according to claim 1, wherein the output optical assembly (18) is movable between the first operating position and the second operating position.

3. The light fixture according to claim 1 or 2, wherein the optical axis (0) of the output optical assembly (18) is aligned with the longitudinal axis (Bl, B2) of one of the at least two mixing devices (16) .

4. The light fixture according to any of the preceding claims, wherein each source assembly (15) comprises at least three light sources (21) configured to emit light beams having different light emission spectra (RGBW) .

5. The light fixture according to any of the preceding claims, wherein the source assemblies (15) are coupled to a support plate (28) and are arranged at a specified distance from each other.

6. The light fixture according to claim 5, wherein the source assemblies (15) are arranged side-by-side and not aligned .

7. The light fixture according to any of the preceding claims, wherein each mixing device (16) comprises an optical body (24) and a support body (25) configured to support the optical body (24) ; the optical body (24) being an elongated body extending along a respective longitudinal axis (Bl, B2) .

8. The light fixture according to claim 7, wherein the optical body (24) has an increasing cross section starting from a first end (26) defining, in use, the input (22) of the mixing device (16) to a second end (27) defining, in use, the output (23) of the mixing device (16) .

9. The light fixture according to claim 7 or 8, wherein the support body (25) is a hollow body provided with a through channel (30) , within which the optical body (24) is, at least in part, housed.

10. The light fixture according to any of claims 7 to 9, wherein the mixing device (16) further comprises an optical end element (32) disposed at one end (27) of the optical body (24) defining, in use, the output (23) of the mixing device (16) .

11. The light fixture according to any of claims 7 to 10, wherein the support bodies (25) of the at least two mixing devices (16) are coupled together to form a single body configured to support the at least two optical bodies (24) .

12. The light fixture according to any of the preceding claims, provided with a housing (2) extending along a longitudinal axis (A) and comprising a plurality of light modules (4) arranged side by side.

13. The light fixture according to claim 12, comprising at least one frame (29) configured to support the output optical assemblies (18) of at least a group of the plurality of light modules (4) and at least one actuator configured to move the at least one frame (29) such that the output optical assemblies (18) of the light modules (4) move between the first operating position and the second operating position .

14. The light fixture according to claim 13, wherein the frame (29) is movable along a plane transverse to the longitudinal axis (A) .

15. The light fixture according to any of claims 12 to 14, wherein the source assemblies (15) of each light module (4) are centred on respective and distinct radial directions relative to the longitudinal axis (A) .

16. The light fixture according to any one of claims 12 to 15, wherein the source assemblies (15) of each light module (4) are offset from each other along a circumferential direction relative to the axis (A) .

17. A method for operating a light fixture, preferably a stage light fixture, comprising at least one light module (4) provided with:

• an output optical assembly (18) provided with an optical axis (0) and placed downstream of the at least two mixing devices (16) for intercepting the light beams exiting the at least two mixing devices (16) ; the method comprising the step of moving, along the optical axis (0) , one of the output optical assembly (18) and the mixing assembly (13) between a first operating position, wherein the output optical assembly (18) is proximal to the output (23) of the mixing devices (16) , and a second operating position, wherein the output optical assembly (18) is distal to the output (23) of the mixing devices (16) .

18. The method according to claim 17, comprising the step of independently adjusting the source assemblies (15) .

19. The method according to claim 17 or 18, comprising the step of independently adjusting the light sources (21) of the source assemblies (15) .

21