Lamp circuit of light emitting device

A lamp circuit of a light emitting device for applying to a lamp holder which comprises an electrical ballast, a first lamp contact, and a second lamp contact, wherein one end of the electrical ballast which has a resonant frequency is electrically connected with the first lamp contact and the other end of the electrical ballast is electrically connected with the second lamp contact, comprising:

• a capacitor electrically connected between the first lamp contact and the second lamp contact, wherein the capacitor is utilized to change the resonant frequency of the electrical ballast;
• a rectification unit electrically connected respectively to the first lamp contact and the second lamp contact, wherein the rectification unit receives an alternating current voltage transmitted by the lamp holder and rectifies the alternating current voltage to generate a direct current voltage;
• a current limiting unit electrically connected to the rectification unit and generating a direct current corresponding to the direct current voltage;
• and
• the light emitting element electrically connected between the current limiting unit and the rectification unit for generating a light source corresponding to the direct current.

A lamp circuit of a light emitting device for allowing a light emitting element directly installed in a fluorescent lamp holder which has an electrical ballast, a first lamp contact, and a second lamp contact, wherein the electrical ballast comprises a ballast rectification unit, a power factor corrector, a resonance converter, a inductor, and a ballast capacitor, wherein one end of the ballast capacitor is electrically connected with the first lamp contact and the other end of the ballast capacitor is electrically connected with the second lamp contact, comprising:

• a capacitor electrically connected between the first lamp contact and the second lamp contact;
• a rectification unit electrically connected respectively to the first lamp contact and the second lamp contact, wherein the rectification unit receives an alternating current voltage transmitted by the lamp holder and rectifies the alternating current voltage to generate a direct current voltage;
• a current limiting unit electrically connected to the rectification unit for generating a direct current corresponding to the direct current voltage;
• and
• the light emitting element electrically connected between the current limiting unit and the rectification unit for generating a light source corresponding to the direct current.