Patent ID: 11893868
Assignee: VAXCEL INTERNATIONAL CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  F  H  Y | IPC F  G  H

Claim 53:
54. The LED lighting device configured with a tunable diffused light color temperature according to claim 52, wherein when said plurality of LEDs are white light LEDs produced by coating at least one phosphor compound on surfaces of LEDs, said reference value of said threshold voltage Vth is estimated at 2.5 volts and said reference value of said maximum operating voltage Vmax is estimated at 3.5 volts subject to an operating condition that a temperature of each LED connecting pin is controlled at or below 80 degree centigrade, wherein said voltage V across each LED of said plurality of LEDs complies with an operating constraint of 2.5 volts<V<3.5 volts, wherein the working voltage VN imposed on the first LED load is required to operate in a domain NS×2.5 volts<VN<NS×3.5 volts, and the working voltage VM imposed on the second LED load is required to operate in a domain MS×2.5 volts<VM<MS×3.5 volts, wherein NS and MS respectively denoting the numbers of in series connected LEDs in the first LED load and the second LED load, wherein NS≤N and MS≤M.