A lighting apparatus, comprising: a circuit board ; a lighting element disposed on the circuit board , the lighting element comprising a lighting top surface and a lighting lateral surface , the lighting lateral surface adjoined to the lighting top surface and the circuit board , the lighting top surface having a center (O) and an optical axis (A), the optical axis (A) passing through the center (O); and a lens structure covering the lighting element for receiving a light from the lighting element , the lens structure comprising an outer surface , the outer surface comprising a total reflection portion and a light outgoing portion , the optical axis (A) passing through the total reflection portion , the light outgoing portion surrounding the total reflection portion , the total reflection portion being configured to totally reflect a portion of light from the center (O), the light outgoing portion being configured to allow another light from the center (O) to leave away from the lens structure , characterized in that , the total reflection portion satisfies: ∠ Q 2 ⁢ Q 1 ⁢ Q 3 = arctan Δ ⁢ R 1 R 1 • Δ ⁢ θ 1 > arcsin 1 n , wherein Q1 is a first point on the total reflection portion , and Q2 is a second point immediately adjacent to the first point, and Q3 is a third point located on a connection line connecting the second point and the center (O), and a connection line connecting the third point and the first point is perpendicular to a connection line connecting the center (O) and the first point, R1 is a distance from the center to the first point, Δ R 1 is a distance from the second point to the third point, Δ θ 1 is an included angle defined by the connection line connecting the first point and the center (O) and the connection line connecting the second point and the center (O), and n is a refractive index of a material of the lens structure . a circuit board ; a lighting element disposed on the circuit board , the lighting element comprising a lighting top surface and a lighting lateral surface , the lighting lateral surface adjoined to the lighting top surface and the circuit board , the lighting top surface having a center (O) and an optical axis (A), the optical axis (A) passing through the center (O); and a lens structure covering the lighting element for receiving a light from the lighting element , the lens structure comprising an outer surface , the outer surface comprising a total reflection portion and a light outgoing portion , the optical axis (A) passing through the total reflection portion , the light outgoing portion surrounding the total reflection portion , the total reflection portion being configured to totally reflect a portion of light from the center (O), the light outgoing portion being configured to allow another light from the center (O) to leave away from the lens structure , characterized in that , the total reflection portion satisfies: ∠ Q 2 ⁢ Q 1 ⁢ Q 3 = arctan Δ ⁢ R 1 R 1 • Δ ⁢ θ 1 > arcsin 1 n , wherein Q1 is a first point on the total reflection portion , and Q2 is a second point immediately adjacent to the first point, and Q3 is a third point located on a connection line connecting the second point and the center (O), and a connection line connecting the third point and the first point is perpendicular to a connection line connecting the center (O) and the first point, R1 is a distance from the center to the first point, Δ R 1 is a distance from the second point to the third point, Δ θ 1 is an included angle defined by the connection line connecting the first point and the center (O) and the connection line connecting the second point and the center (O), and n is a refractive index of a material of the lens structure . <EOS>