A light emitting device comprising: a film-based lightguide comprising at least one light emitting region with a plurality of light extraction features; at least one light source positioned to emit light into the film-based lightguide such that the light propagates through the film-based lightguide in a waveguide condition and exits the film-based lightguide in the light emitting region; and a film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) physically coupled to the film based lightguide and configurable to adjust at least one of an orientation and a shape of the light emitting region such that an angular light output profile (12109, 12902, 12904) of the light exiting the light emitting device from the light emitting region changes when the light source emits light that travels in a waveguide condition through the film-based lightguide, wherein the angular light output profile (12109, 12902, 12904) is changed by changing at least one of an orientation and a shape of the light emitting region by: adjusting the film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) to change the orientation by changing a first radius of curvature of the light emitting region to a second radius of curvature to change the angular light output profile of the light emitted from the light emitting device; or adjusting the film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) to adjust the shape of the light emitting region of the film-based lightguide. a film-based lightguide comprising at least one light emitting region with a plurality of light extraction features; at least one light source positioned to emit light into the film-based lightguide such that the light propagates through the film-based lightguide in a waveguide condition and exits the film-based lightguide in the light emitting region; and a film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) physically coupled to the film based lightguide and configurable to adjust at least one of an orientation and a shape of the light emitting region such that an angular light output profile (12109, 12902, 12904) of the light exiting the light emitting device from the light emitting region changes when the light source emits light that travels in a waveguide condition through the film-based lightguide, wherein the angular light output profile (12109, 12902, 12904) is changed by changing at least one of an orientation and a shape of the light emitting region by: adjusting the film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) to change the orientation by changing a first radius of curvature of the light emitting region to a second radius of curvature to change the angular light output profile of the light emitted from the light emitting device; or adjusting the film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) to adjust the shape of the light emitting region of the film-based lightguide. adjusting the film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) to change the orientation by changing a first radius of curvature of the light emitting region to a second radius of curvature to change the angular light output profile of the light emitted from the light emitting device; or adjusting the film adjustment mechanism (12301, 12401, 12403, 12404, 12901, 13201, 13202, 13501, 13701, 13806, 14202, 14203, 15101, 15901) to adjust the shape of the light emitting region of the film-based lightguide.