NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

Rough service lamps are particularly resistant to what hazards?

1. Color shift

2. Line voltage variations

3. Shock and vibration

4. Wide range of ambient temperatures

The correct answer is: Shock and vibration

Rough service lamps are specifically designed to withstand challenging environmental conditions, particularly shock and vibration. These lamps are constructed with reinforced filaments and more durable glass, allowing them to perform well even in situations where they might be subjected to physical disturbances or impacts. This quality makes them suitable for use in industrial settings, construction sites, and areas where equipment is frequently moved or jostled. While other options include factors that can impact lighting performance, they do not relate directly to the design features of rough service lamps. For instance, color shift pertains to the change in color temperature that light sources might experience over time, which is not typically a focus of rough service design. Line voltage variations deal with fluctuations in electricity supply, which can affect all bulbs, not specifically rough service types. The ability to operate in a wide range of ambient temperatures is an advantage of some bulbs, but not uniquely so for rough service lamps, as other types of bulbs are also designed for temperature resilience. Therefore, the primary feature that stands out for rough service lamps is indeed their resistance to shock and vibration.