Why should you never touch the glass on a stage lamp with your fingers?

Why should you never touch the glass on a stage lamp with your fingers?

• A. It is dangerous
• B. It might spark
• C. It will cause the glass to crack
• D. Grease will be deposited on the lamp and lead to lamp failure

Answer: (D)

Grease from your fingers leaves a film on the lamp glass. Stage lamps get extremely hot, and that oily layer changes how heat is conducted and dissipated. The oil can bake onto the glass, creating hot spots that stress the material and the lamp components over time. This makes the glass weaker and the lamp more prone to failure. So, the correct idea is that grease deposition on the lamp leads to lamp failure. The other ideas—that touching is simply dangerous, might spark, or would crack the glass just from contact—don’t describe the real mechanism as well as the oil residue that can cause overheating and damage. Keeping the glass clean prevents this risk and helps the lamp stay reliable.

Grease from your fingers leaves a film on the lamp glass. Stage lamps get extremely hot, and that oily layer changes how heat is conducted and dissipated. The oil can bake onto the glass, creating hot spots that stress the material and the lamp components over time. This makes the glass weaker and the lamp more prone to failure. So, the correct idea is that grease deposition on the lamp leads to lamp failure. The other ideas—that touching is simply dangerous, might spark, or would crack the glass just from contact—don’t describe the real mechanism as well as the oil residue that can cause overheating and damage. Keeping the glass clean prevents this risk and helps the lamp stay reliable.