LED Device With High Color-Rendering Index

[0016]Please refer to FIGS. 1 to 3, which are top, side, and perspective views, respectively, of a light-emitting-diode (LED) device with high color-rendering index according to a preferred embodiment of the present invention. As shown, the LED device comprises a substrate 10, three white light units 20, and a red light unit 30.

[0017]The substrate 10 is a plate having a predetermined thickness and made of a material with high thermal conductivity.

[0018]The white light units 20 are arranged on the substrate 10 and can be disposed in any geometrical pattern. Each of the white light units 20 is an LED element that incorporates a blue light chip with fluorescent glue to emit a mixed light. Since the fluorescent glue has yellow fluorescent powder blended therein, the LED element can be activated to emit an approximate white light. Please further refer to FIG. 4 as well, in which a CIE 1931 xy chromaticity diagram is shown. The location of the white light emitted by the preferred white light