A solid state lighting lamp (10) for replacing a gas discharge lamp (1) having a light emission area (3) with a given light center length (A) and a given light emission area length (B) is disclosed. The solid state lighting lamp comprises a base portion (11) including a connector (12); an upper portion (13) opposite said base portion; and a plurality of linear arrays of solid state lighting sources (17) mounted on a body (21) and extending in parallel with a central axis (30) of the lamp, each linear array having a central point within 10% tolerance of the given light center length from the connector, wherein, for each linear array: an upper solid state lighting source (17a) lies on an upper virtual conical surface (30) extending from a point of said central axis coinciding with an upper edge of the light emission area under a first internal angle (α) between said central axis and the upper virtual conical surface in a range 40-85°; and a lower solid state lighting source (17b) lies on a lower virtual conical surface (40) extending from a further point of said central axis coinciding with a lower edge of the light emission area under a second internal angle (β) between said central axis and the lower virtual conical surface in a range 40-85°. A luminaire comprising such a solid state lighting lamp is also disclosed.