What is the primary concern for Class 4 lasers?

Class 4 lasers pose a significant risk because they can cause severe injuries to the skin and eyes upon exposure. Additionally, their intense energy can ignite flammable materials, making them a fire hazard. This potential for causing serious harm highlights the importance of stringent safety measures when working with or around these types of lasers. Understanding that Class 4 lasers require careful handling and protective measures is crucial in environments where they are utilized. The other options downplay the risks associated with Class 4 lasers and do not adequately address the severity of the dangers they present.