How can a bulb be in luminous objects?

Luminous objects - Those objects that emit light of their own or has their own source.

Example- Sun, Candle, Tubelight and Bulb give out or emit their own light and hence, are luminous objects.

Non-luminous objects - Those objects which do not emit light on their own or hasn't their own source.

Example- Moon does not emit its own light and glows by reflecting the light of the sun.

From the above explanation, it can be concluded that a bulb is a luminous object.