Side emitting LED and lens

A light-emitting device comprising:

• a light-emitting semiconductor device;
• and
• a lens comprising:
• a bottom surface;
• a reflecting surface;
• a first refracting surface obliquely angled with respect to a central axis of the lens;
• and
• a second refracting surface extending as a smooth curve from the bottom surface to the first refracting surface;
• wherein light emitted by the semiconductor device, entering the lens through the bottom surface, and directly incident on the reflecting surface is reflected from the reflecting surface to the first refracting surface and refracted by the first refracting surface to exit the lens in a direction substantially perpendicular to the central axis of the lens, and
• wherein light emitted by the semiconductor device, entering the lens through the bottom surface, and directly incident on the second refracting surface is refracted by the second refracting surface to exit the lens in a direction substantially perpendicular to the central axis of the lens.

A lens cap comprising:

• a bottom surface attachable to a lens;
• a reflecting surface;
• a first refracting surface obliquely angled with respect to a central axis of the lens cap;
• and
• a second refracting surface extending as a smooth curve from the bottom surface to the first refracting surface;
• wherein light entering the lens cap through the bottom surface and directly incident on the reflecting surface is reflected from the reflecting surface to the first refracting surface and refracted by the first refracting surface to exit the lens cap in a direction substantially perpendicular to the central axis of the lens, and
• wherein light entering the lens cap through the bottom surface and directly incident on the second refracting surface is refracted by the second refracting surface to exit the lens cap in a direction substantially perpendicular to the central axis of the lens cap.