LED lamp with high color rendering index
DCFirst Claim
1. An LED lamp sized and shaped as a replacement for an omnidirectional standard incandescent bulb, the LED lamp comprising:
- an LED assembly further comprising at least first and second LEDs in LED device packages operable to emit light of at least two different colors;
a support between the LED assembly and a power supply; and
a domed enclosure comprising a color mixing section and a substantially transparent section closer to the power supply, the substantially transparent section having a higher transmittance-to-reflectance ratio than most of the domed enclosure;
wherein the domed enclosure is also configured so that light from the LED assembly, when the LEDs are energized, passes through the domed enclosure without wavelength conversion outside of the LED device packages and is emitted in a substantially omnidirectional pattern with a color rendering index (CRI) of at least 90.
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Abstract
An LED lamp with a high color rendering index (CRI) is disclosed. Example embodiments of the invention provide an LED lamp with a relatively high color rendering index (CRI). In some embodiments, the lamp has other advantageous characteristics, such as good angular uniformity. In some embodiments, the LED lamp is sized and shaped as a replacement for a standard incandescent bulb, and includes an LED assembly with at least first and second LEDs operable to emit light of two different colors. In some embodiments, the lamp can emit light with a color rendering index (CRI) of at least 90 without remote wavelength conversion. In some embodiments, the LED lamp conforms some, most, or all of the product requirements for a 60-watt incandescent replacement for the L prize.
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Citations
42 Claims
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1. An LED lamp sized and shaped as a replacement for an omnidirectional standard incandescent bulb, the LED lamp comprising:
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an LED assembly further comprising at least first and second LEDs in LED device packages operable to emit light of at least two different colors; a support between the LED assembly and a power supply; and a domed enclosure comprising a color mixing section and a substantially transparent section closer to the power supply, the substantially transparent section having a higher transmittance-to-reflectance ratio than most of the domed enclosure; wherein the domed enclosure is also configured so that light from the LED assembly, when the LEDs are energized, passes through the domed enclosure without wavelength conversion outside of the LED device packages and is emitted in a substantially omnidirectional pattern with a color rendering index (CRI) of at least 90. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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- 21. An LED lamp sized and shaped as a replacement for an omnidirectional standard incandescent bulb, the LED lamp comprising an LED assembly including at least two groups of LEDs, wherein one group, if illuminated, would emit light having a dominant wavelength from 440 to 480 nm, and a second group, if illuminated, would emit light having a dominant wavelength from 605 to 630 nm, the one group being packaged with a lumiphor, which, when excited, emits light having a dominant wavelength from 560 to 580 nm, wherein the LED lamp includes a support between the LED assembly and a power supply, wherein the support is selected from a group consisting of a conical reflective surface, a thermal post and a heat pipe so that light from the LED assembly is emitted in a substantially omnidirectional pattern without wavelength conversion and with a color rendering index (CRI) of at least 90 through a domed enclosure having a substantially transparent section close to the LED assembly.
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24. A method of making an omnidirectional LED lamp comprising:
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providing at least first and second LEDs in LED device packages operable to emit light of two different colors; packaging the first and second LEDs, including a lumiphor for at least some of the LEDs to produce an LED assembly that emits light that can be combined to provide light with a color rendering index (CRI) of at least 90; providing a support between the LED assembly and a power supply; connecting the LED assembly to the power supply; and installing a domed enclosure further comprising a color mixing section, and a substantially transparent section closer to the power supply, the substantially transparent section having a higher transmittance-to-reflectance ratio than most of the domed enclosure so that at least some light emitted by the LED assembly when the LEDs are energized exits the LED lamp through the domed enclosure in a substantially omnidirectional pattern without wavelength conversion outside of the LED device packages. - View Dependent Claims (25, 26, 27)
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28. An omnidirectional LED lamp comprising:
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an LED assembly with LEDs configured as two groups of LEDs, wherein one group, if illuminated, would emit light having a dominant wavelength from 435 to 490 nm and is packaged with a lumiphor, which, when excited, emits light having a dominant wavelength from 540 to 585 nm, and a second group, if illuminated, would emit light having a dominant wavelength from 600 to 640 nm; a domed enclosure configured to include a section closer to the LED assembly having a higher transmittance-to-reflectance ratio than most of the domed enclosure so that light from the LED assembly, when the LEDs are illuminated, passes through the domed enclosure without remote wavelength conversion and is emitted in a substantially omnidirectional pattern with a color rendering index (CRI) of at least 90; and an Edison base. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification