A lamp , comprising: a light guide plate having a light incident surface and a light exit surface; a light source disposed adjacent to the light incident surface; a lampshade structure covering the light guide plate , wherein the lampshade structure comprises: a body having an inner concave surface and an outer surface opposite to the inner concave surface ; and a plurality of light guide structures disposed on the inner concave surface or the outer surface , wherein each of the light guide structures has a central thickness (T1, T3, T5) and a peripheral thickness (T2, T4, T6), and the central thickness (T1, T3, T5) is less than the peripheral thickness (T2, T4, T6); and a fixing mount , wherein the light guide plate , the light source and the lampshade structure are disposed on the fixing mount , wherein the fixing mount comprises: a first housing ; a second housing connected to the first housing , wherein the second housing forms an accommodating space together with the first housing , and the light source and a portion of the light guide plate close to the light incident surface are disposed within the accommodating space ; and a support shaft disposed on the first housing , wherein the lampshade structure is disposed on the support shaft to cover the light guide plate and is located at a distance from the light guide plate . a light guide plate having a light incident surface and a light exit surface; a light source disposed adjacent to the light incident surface; a lampshade structure covering the light guide plate , wherein the lampshade structure comprises: a body having an inner concave surface and an outer surface opposite to the inner concave surface ; and a plurality of light guide structures disposed on the inner concave surface or the outer surface , wherein each of the light guide structures has a central thickness (T1, T3, T5) and a peripheral thickness (T2, T4, T6), and the central thickness (T1, T3, T5) is less than the peripheral thickness (T2, T4, T6); and a body having an inner concave surface and an outer surface opposite to the inner concave surface ; and a plurality of light guide structures disposed on the inner concave surface or the outer surface , wherein each of the light guide structures has a central thickness (T1, T3, T5) and a peripheral thickness (T2, T4, T6), and the central thickness (T1, T3, T5) is less than the peripheral thickness (T2, T4, T6); and a fixing mount , wherein the light guide plate , the light source and the lampshade structure are disposed on the fixing mount , wherein the fixing mount comprises: a first housing ; a second housing connected to the first housing , wherein the second housing forms an accommodating space together with the first housing , and the light source and a portion of the light guide plate close to the light incident surface are disposed within the accommodating space ; and a support shaft disposed on the first housing , wherein the lampshade structure is disposed on the support shaft to cover the light guide plate and is located at a distance from the light guide plate . a first housing ; a second housing connected to the first housing , wherein the second housing forms an accommodating space together with the first housing , and the light source and a portion of the light guide plate close to the light incident surface are disposed within the accommodating space ; and a support shaft disposed on the first housing , wherein the lampshade structure is disposed on the support shaft to cover the light guide plate and is located at a distance from the light guide plate . <EOS>