Built-in lamp apparatus for suspended ceilings is provided with a base fixed in the space provided in the suspended ceiling, wherein a reflection cover is installed on the base. A fixed seat and a bulb socket holder are installed inside and in the top of the reflection cover respectively. The bulb socket holder comprises a plurality of fixed plates provided on the periphery of a baseboard. One to four bulb sockets and bulbs can be installed on the plurality of fixed plates. On the center of the baseboard is placed a vertical center shaft, which extends upwardly. The center shaft extends further to the top of the reflection cover, wherein a heat-dissipating passage is provided on the top of the reflection cover. Pass the hollow sphere-shaped lampshade through the base hole of the above-described base and then connects the lampshade top with the described fixed seat. Consequently, the bulb socket holder, bulb sockets, and bulbs are contained inside the space of the lampshade. The lampshade may have a variety of colors, coupled with its sphere shape, creating a fresh atmosphere and emitting harmonized and soft light.