LED-based lamp with user-selectable color temperature

A lamp, comprising:

• a first set of light emitting diodes configured to emit blue light having first wavelengths in a first wavelength range in a spectrum of blue light, wherein the first set of light emitting diodes includes a first phosphor configured to convert the blue light having the first wavelengths to light of a first color;
• a second set of light emitting diodes configured to emit blue light having the first wavelengths in the first wavelength range in the spectrum of blue light, wherein the second set of light emitting diodes includes a second phosphor configured to convert the blue light having the first wavelengths to light of a second color;
• a third set of light emitting diodes configured to emit ultraviolet light having second wavelengths in a second wavelength range in a spectrum of ultraviolet light, wherein the third set of light emitting diodes includes a third phosphor configured to convert the ultraviolet light having the second wavelengths to blue light, and wherein the light having the first and second colors combines with the blue light generated by the third set of light emitting diodes to produce white light;
• a first switch located at a base portion of the lamp, wherein a state of the first switch corresponds to a color temperature of the white light;
• and
• a color temperature adjustment module configured to vary outputs of the first, second, and third sets of light emitting diodes in accordance with the color temperature of the white light selected by a user using the first switch.

A method, comprising:

• generating first light using a first set of light emitting diodes;
• generating second light using a second set of light emitting diodes;
• generating third light using a third set of light emitting diodes;
• producing white light by combining the first light, the second light, and the third light;
• changing a state of a first switch located at a base portion of a lamp comprising the first, second, and third sets of light emitting diodes, wherein the state of the first switch corresponds to a color temperature of the white light;
• and
• varying outputs of the first, second, and third sets of light emitting diodes in accordance with the color temperature of the white light selected by a user using the first switch.

A method, comprising:

• emitting, using a first set of light emitting diodes, blue light having first wavelengths in a first wavelength range in a spectrum of blue light;
• converting, using a first phosphor, the blue light having the first wavelengths to light of a first color;
• emitting, using a second set of light emitting diodes, blue light having the first wavelengths in the first wavelength range in the spectrum of blue light;
• converting, using a second phosphor, the blue light having the first wavelengths to light of a second color;
• emitting, using a third set of light emitting diodes, ultraviolet light having second wavelengths in a second wavelength range in a spectrum of ultraviolet light;
• converting, using a third phosphor, the ultraviolet light having the second wavelengths to blue light;
• producing white light by combining the light having the first and second colors with the blue light generated by the third set of light emitting diodes;
• changing a state of a first switch located at a base portion of a lamp comprising the first, second, and third sets of light emitting diodes, wherein the state of the first switch corresponds to a color temperature of the white light;
• and
• varying outputs of the first, second, and third sets of light emitting diodes in accordance with the color temperature of the white light selected by a user using the first switch.