LED lamp with high color rendering index
First Claim
1. An LED lamp comprising:
- an Edison base;
an LED assembly further comprising at least first and second LED device packages that emit light of at least two different colors; and
an optical enclosure around the LED assembly connected to the Edison base to form an A shaped replacement for a standard incandescent light bulb, the optical enclosure comprising a section having a higher transmittance-to-reflectance ratio than most of the optical enclosure;
wherein the optical enclosure and the LED assembly are configured so that light from the LED assembly passes through the optical enclosure without wavelength conversion outside of the LED device packages and is emitted from the lamp with a correlated color temperature (CCT) from 2500K to 3500K that is reduced with dimming to as low as 1200K.
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Accused Products
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
20 Claims
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1. An LED lamp comprising:
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an Edison base; an LED assembly further comprising at least first and second LED device packages that emit light of at least two different colors; and an optical enclosure around the LED assembly connected to the Edison base to form an A shaped replacement for a standard incandescent light bulb, the optical enclosure comprising a section having a higher transmittance-to-reflectance ratio than most of the optical enclosure; wherein the optical enclosure and the LED assembly are configured so that light from the LED assembly passes through the optical enclosure without wavelength conversion outside of the LED device packages and is emitted from the lamp with a correlated color temperature (CCT) from 2500K to 3500K that is reduced with dimming to as low as 1200K. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. An LED lamp comprising an LED assembly including at least two groups of LED device packages that emit light of at least two different colors, and further comprising an optical enclosure around the LED assembly to form an A shaped replacement for a standard incandescent light bulb, the optical enclosure comprising a section having a higher transmittance-to-reflectance ratio than most of the optical enclosure so that light from the LED assembly is emitted through the optical enclosure without remote wavelength conversion outside of the LED device packages and with a correlated color temperature (CCT) from 2500K to 3500K that is reduced with dimming to as low as 1200K.
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15. A method of making an LED lamp comprising:
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providing at least first and second LED device packages operable to emit light of two different colors, at least some of the LED device packages including a lumiphor to produce an LED assembly that can provide light with a correlated color temperature (CCT) from 2500K to 3500K that is reduced with dimming to as low as 1200K; and installing an optical enclosure around the LED assembly to form an A shaped replacement for a standard incandescent light bulb, the optical enclosure comprising a section having a higher transmittance-to-reflectance ratio than most of the optical enclosure, and so that at least some light emitted by the LED assembly when the lamp is energized exits the LED lamp through the optical enclosure without wavelength conversion outside of the LED device packages. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification