Do all bulbs have the same brightness?

No, not all bulbs have the same brightness. The brightness of a bulb depends on its wattage, type (such as incandescent, LED, or CFL), and design. For example, LED bulbs are generally more energy-efficient and can produce the same brightness as higher-wattage incandescent bulbs while using less energy. Additionally, factors like color temperature and lumens also play significant roles in perceived brightness.