Light bulb with adjustable light source

A light bulb, comprising:

• a base for mechanically mounting the light bulb and for receiving electrical power;
• a light guide;
• and
• a light source that directs output light into the light guide, the light source comprising:
• a light emitting device electrically coupled to the base;
• and
• a variable spectrum adjuster in a light path of light emitted by the light emitting device, wherein:
• the light emitting device and the spectrum adjuster are variably positionable relative to one another;
• the spectrum adjuster comprises a wavelength-shifting region comprising wavelength-shifting material, the wavelength-shifting material having a continuously varying wavelength-shifting property based on position in the wavelength-shifting region;
• and
• the wavelength-shifting region has dimensions greater than the cross-sectional dimensions of the light path at the spectrum adjuster.

A light bulb, comprising:

• a base for mechanically mounting the light bulb and for receiving electrical power;
• a light guide;
• and
• a light source that directs output light into the light guide, the light source comprising:
• a light emitting device;
• a variable color attenuator and a variable wavelength shifter in tandem in a light path of light emitted by the light emitting device, wherein:
• the color attenuator, the wavelength shifter and the light path are variably positionable relative to one another;
• the color attenuator comprises a first region of color-attenuating material for attenuating a first portion of the spectrum of light incident thereon, the color-attenuating material having a continuously varying color-attenuating property based on position in the first region;
• and
• the first region has first dimensions greater than the cross-sectional dimensions of the light path at the color attenuator;
• and
• the wavelength shifter comprises a second region of wavelength-shifting material, the wavelength-shifting material having a continuously varying wavelength-shifting property based on position in the second region;
• and
• the second region has second dimensions greater than the cross-sectional dimensions of the light path at the wavelength shifter.

A light bulb, comprising:

• a base for mechanically mounting the light bulb and for receiving electrical power;
• a light guide;
• and
• a light source that directs output light into the light guide, the light source comprising:
• a light emitting device electrically coupled to the base;
• and
• a variable spectrum adjuster in a light path of light emitted by the light emitting device, wherein:
• the light path of light emitted by the light emitting device and the variable spectrum adjuster are variably positionable relative to one another;
• the spectrum adjuster comprises a spectrum-adjusting region comprising spectrum-adjusting material, the spectrum-adjusting material having a continuously varying spectrum-adjusting property based on position in the spectrum-adjusting region;
• and
• the region has dimensions greater than the cross-sectional dimensions of the light path at the spectrum adjuster.