What hazardous material is found in certain lamps aside from mercury?

The correct choice identifies lead as a hazardous material that can be found in certain types of lamps, specifically in some fluorescent lamps and high-intensity discharge lamps. Lead is used in the glass and as part of the electrical components in these lights. This heavy metal can pose significant health risks, including neurological damage, particularly in children and pregnant women, and can contaminate the environment if these lamps are improperly disposed of.

In contrast, other materials mentioned, like electrolytes, sodium, and copper, while they may have roles in different types of lighting technologies, do not carry the same hazardous designations associated with direct health risks from lamps. Sodium, for example, is used in sodium vapor lamps and is not classified as hazardous in the same manner. Understanding these distinctions emphasizes the importance of handling and disposing of certain lamp types carefully to minimize exposure to lead and maintain environmental safety.