A lamp module, connected to lamp cartridge adapter, the lamp module comprising: an external lamp, having at least one of a light-permeable material and a translucent material; two lamp heads, configuring to two terminal of the external lamp, and each lamp head has a plurality of lamp pin; at least one cold cathode fluorescent lamp (CCFL) disposed in the external lamp; and a reflective layer, dispose in the external lamp, the reflective layer having a reflective surface adjacent to and contactless to cold cathode fluorescent lamp.