Optical device for LED-based lamp

An optical device for use in distributing radiant emission, the optical device comprising:

• a transfer section first portion optically configured to receive radiant emission at an inlet end and expanding from the inlet end to an outlet end;
• a transfer section second portion optically configured to receive the radiant emission from the outlet end of the transfer section first portion at an inlet end and contracting from the inlet end to an outlet end;
• wherein the transfer section is configured to produce a Lambertian light distribution at the transfer section second portion outlet end from a Lambertian light distribution at the transfer section first portion inlet end;
• and
• an ejector section situated adjacent and optically coupled with the transfer section second portion outlet end, said transfer section configured to transfer the radiant emission to said ejector section, said ejector section comprising a spherical portion.

An optical device for use in distributing radiant emission, the optical device comprising:

• a transfer section first portion optically configured to receive radiant emission at an inlet end and expanding from the inlet end to an outlet end;
• a transfer section second portion optically configured to receive the radiant emission from the outlet end of the transfer section first portion at an inlet end and contracting from the inlet end to an outlet end;
• wherein the transfer section is configured to produce a Lambertian light distribution at the transfer section second portion outlet end from a Lambertian light distribution at the transfer section first portion inlet end;
• and
• an ejector section situated adjacent and optically coupled with the transfer section second portion outlet end, said transfer section configured to transfer the radiant emission to said ejector section, said ejector section comprising a cone extending from an interface of the transfer section and the ejector section.