What is the necessary action when handling halogen bulbs during replacement?

Using gloves to handle halogen bulbs during replacement is essential to prevent oil contamination on the glass surface. Halogen bulbs operate at very high temperatures, and any oils from your skin can create hot spots on the glass when the bulb is lit. These hot spots may lead to premature failure of the bulb or even cause it to shatter due to uneven heating. By wearing gloves, you not only protect the integrity of the bulb but also extend its lifespan and ensure safe operation. This practice is a standard procedure in the industry for maintaining the performance and safety of halogen lighting systems.

The other methods mentioned would not address the critical concern of oil contamination. Handle only with bare hands would directly risk damaging the bulb, filling it with coolant is not applicable since halogen bulbs do not use coolant, and removing battery connections is unnecessary during such a straightforward task.