Solid state lighting device and luminaire

1. A lamp for replacement of a HPS or HID lamp, comprising:

a support element including a mounting shaft extending therefrom, said mounting shaft being substantially parallel and having lateral displacement relative to a central axis of the lamp;

a plurality of modules each comprising a heat spreading element;

a plurality of sets of solid state lighting elements, wherein each set is mounted on an outer surface of one of said modules;

wherein at least one module is mounted on the mounting shaft and is rotatable about the mounting shaft such that said at least one module can be pivoted between:

a first orientation in which the modules cooperate to define a closed structure with an inner volume, which acts as a chimney structure through which a gas or a gas mixture can flow along the direction of the central axis of the lamp; and

a second orientation in which the at least one module is pivoted away from at least one neighboring module to define an opened structure;

and a holder for holding the support element, said holder comprising a lamp cap to connect the lamp to a power source, wherein the lamp cap is compatible with a socket for the HPS or HID lamp to be replaced.

2. The lamp of claim 1 , wherein in the second orientation the outer surface of the at least one module pivoted away from a neighboring module faces the same direction of the outer surface of the neighboring module.

3. The lamp of claim 1 , wherein the least one module mounted on the mounting shaft has an edge portion comprising a mounting member mounted on the mounting shaft.

4. The lamp of claim 3 , wherein a pair of modules are mounted on the mounting shaft such that the respective edge portions of said pair are facing each other.

5. The lamp of claim 1 , wherein the outer surfaces are curved surfaces such that the closed structure has a substantially cylindrical shape.

6. The lamp of claim 1 , further comprising a locking element for locking the at least one module mounted on the mounting shaft in the first or second orientation.

7. The lamp of claim 6 , wherein:

the mounting shaft comprises a threaded end portion; and

the locking element comprises a nut or screw for engaging with the threaded end portion.

8. The lamp of claim 1 , wherein the support element comprises a pair of mounting shafts, wherein at least one module is rotatably mounted on each mounting shaft.

9. The lamp of claim 8 , wherein the mounting shafts are offset by a same amount in opposite directions.

10. The lamp of claim 1 , wherein each module further comprises an optical element adjustably mounted over the set of solid state lighting elements, wherein the optical element can be adjusted between a first position and a second position, said optical element comprising:

a first lens portion for directing the luminous output of the set of solid state lighting elements in a first direction in said first position; and

a second lens portion spatially separated from the first lens portion for directing the luminous output of the set of solid state lighting elements in a second direction different to the first direction in said second position.

11. The lamp of claim 10 , wherein the optical element is slidably mounted over the set of solid state lighting elements.

12. The lamp of claim 10 , wherein at least one of the first lens portion and the second lens portion is an asymmetric lens portion.

13. The lamp of claim 12 , wherein the asymmetric lens portion is shaped to generate a first luminous distribution portion and a second luminous distribution portion separated from the first luminous distribution portion by a third luminous distribution portion of lower intensity than the first and second luminous distribution portions.

14. An outdoor luminaire comprising the lamp of claim 1 .