The bulb for an Aldis lamp is a vital spare part used in maritime daylight signaling lamps, enabling reliable visual communication via Morse code between vessels or from ship to shore. Designed to withstand harsh marine environments, these bulbs typically come in 12V or 24V configurations with a 60W rating and are compatible with Aldis lamp models like the Francis FSP127. They meet international maritime safety standards such as SOLAS and MED, ensuring durability, brightness, and compliance. Easy to install and essential for emergency signaling, keeping spare Aldis lamp bulbs on board is crucial for maintaining operational readiness at sea.