What is an important step when changing the lamp of a projector?

When changing the lamp of a projector, it is crucial to wait a few minutes after the projector has been turned off to allow the lamp to cool down. This step is important because projector lamps can reach extremely high temperatures during operation. Handling a hot lamp increases the risk of burns and can cause damage to the projector or the new lamp being installed. Waiting for the lamp to cool not only ensures the safety of the person changing the lamp but also helps in preventing thermal shock, which could shorten the lifespan of the new lamp.

Taking immediate action while the lamp is still hot, attempting to clean it in that state, or neglecting to disconnect the power supply – while they may seem like reasonable options in certain contexts – do not prioritize safety and the proper handling of equipment. Therefore, allowing the projector to cool down is the safest and most appropriate first step in the procedure.