Patent ID: 10563855

Abstract:
An LED (light emitting diode) lamp comprises a lamp shell, the lamp shell includes a lamp head, a lamp neck and a sleeve, the lamp head connects to the lamp neck which connects to the sleeve; a passive heat dissipating element having a heat sink connected to the lamp shell, wherein the heat sink comprises fins and a base; a power source having a first portion and a second portion, wherein the first portion of the power source is disposed in both the lamp neck and the lamp head of the lamp shell, and the second portion of the power source is disposed in the heat sink of the passive heat dissipating element; a light board connected to the base of the passive heat dissipating element and comprising LED chips, the LED chips electrically connected to the power source; and a lamp cover with a light output surface, an end surface, an inner reflecting surface and an outer reflecting surface, wherein the inner reflecting surface is disposed inside the light output surface of the lamp cover and the outer reflecting surface is disposed in the outer circle of the array of the LED chips; the inner reflecting surface is configured to reflect part of light emitted from the inmost of the array of LED chips, the outer reflecting surface is configured to reflect part of light emitted from the outermost of the array of LED chips; wherein a ratio of power of the LED lamp to heat dissipating area of the heat sink is 1:20˜30; wherein each of the first fins is divided into two portions in a radial direction of the LED lamp, the two portions are divided with a gap portion, the third portion is connected to the fourth portion through a transition portion, the transition portion has a buffer section and a guide section, a direction of any tangent of the guide section is separate from the gap portion.