What are common causes of light bulb fires?

The choice that addresses common causes of light bulb fires focuses on two significant factors: the presence of combustibles too close to the bulb and the use of over-wattage bulbs.

When light bulbs are used near flammable materials, such as cloth, paper, or other combustible items, the heat generated by the bulb can ignite those materials. Over-wattage bulbs exceed the recommended wattage for fixtures, leading to excessive heat that can also contribute to igniting nearby combustibles. These two factors — proximity to flammable materials and excessive heat generation — are key mechanisms through which light bulb fires occur.

This understanding highlights the importance of following manufacturer guidelines for bulb placement and wattage to prevent hazardous situations. Taking into account the other options, while they present relevant concepts, they do not directly address the fundamental dangers that lead to fires in relation to light bulbs as effectively as the chosen answer does.