The SpectrAlert Advance LENS-B is blue lens used for any indoor or outdoor wall mount strobes.

SpectrAlert Advance color lenses come in four colors options including amber, blue, green and red. The lenses are compatible with SpectrAlert Advance strobes including wall or ceiling mount and indoor or outdoor rated. Note that color lenses must only be used with the non-fire printed devices (-P plain models). Color lens strobes are UL Listed under 1638 (Visual Signaling Appliances) for Private Mode General Utility Signaling. UL 1638 measures light output of strobe devices on-axis (straight on). See table below for ratings. WARNING: Not to be used as a Visual Public Mode Alarm Notification Appliance.