Optic for Providing Biased Illumination

A lens comprising:

• a front;
• a rear disposed opposite the front;
• an axis passing through the front and the rear;
• a first surface extending circumferentially partially about the axis, extending between the front and the rear, and having a first cross-sectional profile perpendicular to the axis;
• and
• a second surface region extending circumferentially partially about the axis, extending between the front and the rear, and having a second cross-sectional profile perpendicular to the axis,
• wherein at the rear of the optic, the first cross-sectional profile is larger than the second cross-sectional profile, and
• wherein at the front of the optic, the first cross-sectional profile is smaller than the second cross-sectional profile.

An optic comprising:

• a cavity that comprises:
• an opening;
• a bottom;
• and
• a sidewall that extends between the opening and the bottom and that circumscribes an axis, the cavity configured to receive light emitted by at least one light emitting diode;
• a first surface that circumscribes the cavity and is configured for totally internally reflecting a first portion of the light that is received in the cavity and that passes through the sidewall of the cavity;
• a second surface that is disposed at the bottom of the cavity and that comprises a pattern of grooves,
• a front;
• and
• a rear disposed opposite to the front and comprising the opening,
• wherein the first surface comprises:
• a third surface region extending circumferentially partially about the cavity and between the front and the rear,
• a fourth surface region extending circumferentially partially about the cavity and between the front and the rear,
• wherein compared to the third surface region, the fourth surface region is radially closer to the axis at the rear of the optic, and
• wherein compared to the fourth surface region, the third surface region is radially closer to the axis at the front of the optic.