Decorative bulb with inner lens

A decorative bulb with inner lens, comprising:

• a mounting base having external thread;
• a light bulb covering mounted on the mounting base, the light bulb covering provided with a light bulb covering cavity along an axis of the light bulb covering;
• an optical lens comprising a mounting part installed in the mounting base and a lens part integrally formed with the mounting part, the lens part is a semi-ellipsoid structure, and a long axis of the lens part coincides with the axis of the light bulb covering, and the lens part is provided with only one cone-shaped cavity inside, a long axis of the cone-shaped cavity coincides with the axis of the light bulb covering, a diameter of the cone-shaped cavity decreases along a direction away from the mounting base, and the lens part is provided with a light refraction strengthening part on an outer surface of the lens part, the light refraction strengthening part radiating outward extends from a top of the lens part along the outer surface of the lens part to a bottom of the lens part, and a transverse cross section of the light refraction strengthening part is in an annular shape with a wavy outer circumference, an angle between a line connecting a crest of a wave of the wavy outer circumference and a first trough of the wave and a line connecting the crest of the wave and a second trough of the wave is defined as an angle A, a vertical distance from the crest of the wave to the annular shape is defined as a height H, the angles A of a plurality of transverse cross sections of the light refraction strengthening part decrease successively along a direction from a bottom of the lens part to a top of the lens part, and the heights H of the plurality of transverse cross sections of the light refraction strengthening part become larger and then smaller along the direction from the bottom of the lens part to the top of the lens part;
• a light unit mounted in the cone-shaped cavity.