What happens to the lighting system when the batteries are low?

When the batteries are low in the SCBA's lighting system, the red light illuminates for 20 seconds and then begins to flash. This visual alert system is designed to notify the user that the battery power is insufficient for optimal operation, allowing them to take appropriate action. The initial steady illumination of the red light serves as a warning signal indicating that the user should be prepared to recharge or replace the batteries soon, while the subsequent flashing serves as a more urgent reminder that action is needed to ensure the functionality and safety of the SCBA unit.

This specific indication helps optimize safety for the user, as maintaining awareness of equipment status is critical in emergency situations where the SCBA is required. The alternate options do not accurately describe the function of the lighting system, reflecting different states that are not utilized when battery levels drop.