Lighting assembly for emitting high intensity light, a light source, a lamp and a luminaire

1. A lighting assembly for emitting light, the lighting assembly comprising:

an elongated structure comprising a flexible substrate and comprising light emitting elements and power connections for providing power to the light emitting elements on the flexible substrate, the light emitting elements being arranged in a longitudinal direction of the elongated structure, a heat transferring element comprising a base plate comprising a first side and an opposite second side, the heat transferring element comprising at the first side a heat sink interface or a heat sink element and comprising at the second side one or more upstanding walls extending away from the second side, the second side is opposite to the first side, the one or more upstanding walls comprising a heat conductive material and being thermally coupled to the first side,

wherein the elongated structure is arranged on a wall surface of at least one of the one or more upstanding walls, the wall surface is one of the surfaces of the one or more upstanding walls that is adjacent to the second side, a surface of the elongated structure through which no light is emitted by the light emitting elements is thermally coupled to the wall surface, a pattern formed by the elongated structure is a meandering or spiral pattern, the pattern is defined in a cross-sectional plane parallel to the second side, the meandering pattern comprises at least three turns and the spiral pattern comprises a plurality of windings, wherein spaces between at least a portion of the one or more upstanding walls form channels, the light emitting elements are arranged to emit at least a portion of their light into the channels; and

wherein at least 75% of the light emitting elements emit a portion of their light towards a second surface of an opposite wall of the channel, wherein the opposite wall of the channel is a portion of the one or more upstanding wall, the opposite wall having two surfaces adjacent to second side of which one is the wall surface and another one is the second surface.

2. A lighting assembly according to claim 1 , wherein reflective material is provided or light outcoupling elements are provided in the channels at least a portion of locations of the one or more channels that are illuminated by the light emitting elements.

3. A lighting assembly according to claim 1 , wherein the light emitting elements emit a light emission and the light emitting elements are arranged such that a central axis of the light emission is substantially parallel to the second side.

4. A lighting assembly according to claim 1 , wherein spaces between at least a portion of the one or more upstanding walls form one or more channels that are covered at an opposite side of the second side with a light transmitting material for sealing the opposite side of the one or more channels, and the one or more channels are provided with a cooling material inlet and a cooling material outlet for allowing a cooling material to flow through the one or more channels for cooling the light emitting elements of the elongated structure.

5. A lighting assembly according to claim 1 , wherein a wall pattern formed by a portion of the one or more upstanding walls is a meandering or spiral pattern, the wall pattern is defined in a cross-sectional plane parallel to the second side.

6. A lighting assembly according to claim 1 , wherein a first portion of the one or more upstanding walls is thermally isolated from a second portion of the one or more upstanding walls while the one or more upstanding walls of the first portion and of the second portion are thermally coupled to the first side.

7. A lighting assembly according to claim 1 , wherein the heat transferring element comprises cooling fins at the first side.

8. A lighting assembly according to claim 1 , wherein the elongated structure is a LED strip.

9. A lighting assembly according to claim 1 , wherein the light emitting elements are solid state light emitters.

10. A lighting assembly according to claim 1 , wherein an angle between the wall surface and the second side is in between 85 and 95 degrees, is optionally in between 88 and 92 degrees and is optionally substantially equal to 90 degrees.

11. A light source composing the lighting assembly according to claim 1 .

12. A lamp comprising the lighting assembly according to claim 10 .

13. A luminaire comprising the lighting assembly according to claim 10 .