A light-emitting diode lamp (100, 900) comprising: an optically-transparent lens including a parabolic section, the parabolic section defined about an axis and having a focus, the parabolic section comprising a continuous surface traverse to the axis and extending from the axis to a periphery of the parabolic section at a first end of the parabolic section, and a channel extending along the axis at least partially inside the parabolic section at a second end of the parabolic section, the second end being substantially opposed to the first end; a riser section extending from the second end of the parabolic section, such that the channel is continuous through the riser section and at least partially inside the parabolic section; and a light-emitting diode assembly comprising a circuit board to which a light-emitting diode is electrically secured and an optically transparent dome being secured to the circuit board, the optically-transparent dome encapsulating the light-emitting diode, the light-emitting diode disposed in the channel at the focus of the parabolic section, the light emitting diode configured to emit light such that first light rays of the light are internally reflected in the lens and collimated through the continuous surface, second light rays of the light are transmitted through the optically transparent lens and the continuous surface in parallel to the axis, and third light rays of the light are refracted by the continuous surface toward the axis, characterized in that: the channel between the dome and the optically-transparent lens is filled with an optically-transparent soft or pliable material having the same index of refraction as the optically-transparent lens and the dome to eliminate an interface of the optically-transparent lens and the light-emitting diode. an optically-transparent lens including a parabolic section, the parabolic section defined about an axis and having a focus, the parabolic section comprising a continuous surface traverse to the axis and extending from the axis to a periphery of the parabolic section at a first end of the parabolic section, and a channel extending along the axis at least partially inside the parabolic section at a second end of the parabolic section, the second end being substantially opposed to the first end; a riser section extending from the second end of the parabolic section, such that the channel is continuous through the riser section and at least partially inside the parabolic section; and a light-emitting diode assembly comprising a circuit board to which a light-emitting diode is electrically secured and an optically transparent dome being secured to the circuit board, the optically-transparent dome encapsulating the light-emitting diode, the light-emitting diode disposed in the channel at the focus of the parabolic section, the light emitting diode configured to emit light such that first light rays of the light are internally reflected in the lens and collimated through the continuous surface, second light rays of the light are transmitted through the optically transparent lens and the continuous surface in parallel to the axis, and third light rays of the light are refracted by the continuous surface toward the axis, the channel between the dome and the optically-transparent lens is filled with an optically-transparent soft or pliable material having the same index of refraction as the optically-transparent lens and the dome to eliminate an interface of the optically-transparent lens and the light-emitting diode.