Edwards Signaling 50LMP-9WH-D Replacement Halogen Lamp, 9W. A distinctive audible-visual signaling system, the Edwards Signaling AdaptaLight Stackable Beacon can stack up to five light modules and a pulsating horn. It is intended for heavy-duty use in places where a need for visibility over greater distances exists. Each module has a gasket. The AdaptaLight Stackable Beacon's base houses a pulsing horn with an 85 dB at 10 feet rating. The horn can be used independently as a sixth signal or in tandem with any of the light modules.