Lighting module assembly

1. A lighting module assembly comprising:

a stack of optical elements comprising a diffuser, a light guide plate, and a reflector,

a plurality of elongated arms forming a frame for supporting the stack of optical elements, at least one elongated arm having a cavity extending in an elongation direction of the elongated arm, and

at least one lighting element, wherein

the cavity is arranged for receiving the at least one lighting element and for directing the light of the lighting element, in use, to the stack of optical elements, and

each elongated arm comprises a first elongated arm part, wherein

at least one first elongated arm part is integrally formed with at least one of the diffuser, and the light guide plate and, wherein

at least one elongated arm comprises a second elongated arm part for joining in the elongation direction with the first elongated arm part of the same elongated arm.

2. A lighting module assembly according to claim 1 , wherein said joining encloses the lighting element in the cavity.

3. A lighting module assembly according to claim 2 , wherein the first elongated arm part and the second elongated arm part are integrally formed and connected together by a living hinge such that the first elongated arm part and second elongated arm part are arranged to be joined by bending the second elongated arm part relative to the first elongated arm part along the living hinge.

4. A lighting module assembly according to claim 2 , wherein the first elongated arm part has at least a receiving element and the second elongated arm part has at least an engaging element,

the engaging element for engaging the receiving element.

5. A lighting module assembly according to claim 4 , wherein the engaging element is arranged to snap into the receiving element.

6. A lighting module assembly according to claim 2 , wherein the first elongated arm parts and/or the second elongated arm parts are integrally formed by injection molding.

7. A lighting module assembly according to claim 2 , wherein the first elongated arm part and/or the second elongated arm part are made of plastic.

8. A lighting module assembly according to claim 1 , wherein the diffuser is integrally formed with the first elongated arm parts and comprises a protrusion along edges of the lighting module assembly overlapping the lighting element and extending with a slanted profile towards a direction perpendicular to the elongation direction along which the light, in use, exits the module, the slanted profile having an angle of 45 degrees or less.

9. A lighting module assembly according to claim 1 , wherein the light guide plate is integrally formed with the first elongated arm parts and comprises elongated openings through the light guide plate arranged in the elongation direction at edges of the lighting module assembly in proximity of the elongated arms.

10. A lighting module assembly according to claim 9 , comprising a reflector arranged under the light guide plate and extending through the elongated openings.

11. A lighting module assembly according to a claim 1 , comprising a heat spreading element for spreading the heat generated, in use, by the lighting element, the heat spreading element arranged in the cavity on a back side of the lighting element for supporting the lighting element in the cavity and partially extending under the stack.

12. A lighting module assembly according to claim 11 , wherein the heating spreading element comprises a spring portion arranged to snap into the cavity.

13. A lighting module assembly according to claim 1 , further comprising a driver unit arranged in the cavity for controlling the at least one lighting element.

14. A lighting module assembly according to claim 1 , wherein the lighting element comprises one or more light emitters.

15. A lighting module assembly according to claim 1 , wherein the lighting module assembly comprises four internally connected elongated arms.