This filter allows you to soften the rendering of your photos made with some BIGBLUEDiveLights and allows the most creative people to propose unique renderings.
Unlike UV light, blue light is not invisible to the human eye, so without a filter you will not be able to see the fluorescence because it will be overwhelmed by the ambient light.
The Battery for the VL18000, CB16500 & TL8000 from BIGBLUEDiveLights will be very useful for your travels but also if you are used to make several dives in the same day.