This is the most common type of bulb, considered a “standard” bulb. They produce a warm, steady light, ideal for most household applications. They’re generally the least expensive type of bulb, they can be used on a dimmer, and are middle-of-the-road efficient. Expect a standard incandescent bulb to last for 700-1,000 hours.
While incandescent refers to the way the light is created within the bulb, it can actually have different bases. An “M base” is a medium based bulb (sometimes referred to as an “E base”, Edison base or “A Base”). Again, this is probably the single-most popular bulb on the lighting market. And a “C base” refers to a candelabra based bulb (more on that below).
As far as shape, incandescent bulbs can be found in globes, as small, round lamps for a decorative touch, or mimicking a flame