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Spectroscopy is the study of the interaction between matter and radiated energy. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, e.g., by a prism.

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Barrier Filter Discussion

Barrier filters are usually made from acrylic but sometimes they are also made from glass, mostly for camera filters. The advantage of acrylic is that it is easier to cut

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Blue Light vs. UV Light?

Large Flower Coral, Day Fluorescing, Palau, Rock Islands-World Heritage Site, Micronesia Fluorescence diving is almost universally referred to as UV diving but in fact it is rarely done using UV

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Discussion on Lumens

Sheet Coral, Day Fluorescing, Palau, Rock Islands-World Herititage Site, Micronesia We are asked nearly every day how many lumens our blue light torches emit.  Simply stated, you can’t measure a

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The Science of Fluorescence

The Science Behind Light Fluorescence in Dive Photography Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of

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Excitation Filter Discussion

A dichroic filter, or interference filter, is a very accurate color filter used to selectively pass light of a small range of colors while reflecting all other colors. Dichroic filters

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Technology Discussion

Generally there are two ways of experiencing underwater fluorescence, either with invisible (ultraviolet) or with visible (usually blue) excitation light. In the case of ultraviolet excitation light (with wavelengths <400

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