A LED module comprising: a LED chip including at least one LED arranged to direct a luminous output centered about an optical axis towards a light exit surface; an optical layer separated from the light exit surface by a spacing region having a lower refractive index than the optical layer and a material comprising the light exit surface, the optical layer being arranged to redirect the luminous output in a direction under a non-zero angle with the optical axis; and a collimating element over the optical layer, the collimating element being arranged to collimate the redirected luminous output in said direction wherein the optical layer comprises: a first region arranged to redirect a first portion of the luminous output in a first direction under a first non-zero angle with the optical axis; and a second region arranged to redirect a second portion of the luminous output in a second direction under a second non-zero angle with the optical axis, the first direction being different to the second direction; characterized in that the collimating element is arranged over the first region to collimate the first portion of the redirected luminous output in said first direction, the LED module further comprising a further collimating element arranged over the second region to collimate the second portion of the redirected luminous output in said second direction. a LED chip including at least one LED arranged to direct a luminous output centered about an optical axis towards a light exit surface; an optical layer separated from the light exit surface by a spacing region having a lower refractive index than the optical layer and a material comprising the light exit surface, the optical layer being arranged to redirect the luminous output in a direction under a non-zero angle with the optical axis; and a collimating element over the optical layer, the collimating element being arranged to collimate the redirected luminous output in said direction wherein the optical layer comprises: a first region arranged to redirect a first portion of the luminous output in a first direction under a first non-zero angle with the optical axis; and a second region arranged to redirect a second portion of the luminous output in a second direction under a second non-zero angle with the optical axis, the first direction being different to the second direction; characterized in that the collimating element is arranged over the first region to collimate the first portion of the redirected luminous output in said first direction, the LED module further comprising a further collimating element arranged over the second region to collimate the second portion of the redirected luminous output in said second direction. a first region arranged to redirect a first portion of the luminous output in a first direction under a first non-zero angle with the optical axis; and a second region arranged to redirect a second portion of the luminous output in a second direction under a second non-zero angle with the optical axis, the first direction being different to the second direction; characterized in that the collimating element is arranged over the first region to collimate the first portion of the redirected luminous output in said first direction, the LED module further comprising a further collimating element arranged over the second region to collimate the second portion of the redirected luminous output in said second direction.