Light bulb vs Tennis ball: size comparison
Light bulb: 11 cm. Tennis ball: 6.7 cm. Both silhouettes are drawn at the same scale.
Size ratio: ×1.6
Light bulb
11 cm
What is measured Height of an A60-shaped light bulb
The "60" in A60 is its diameter: 60 mm.
Source : Wikipedia — Incandescent light bulb
Tennis ball
6.7 cm
What is measured Diameter of a regulation tennis ball
Rules require a diameter between 6.54 and 6.86 cm.
Source : Wikipedia — Tennis ball