Spectrography
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
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
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
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
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
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
Biology of Why Marine Life Fluoresces
It is not well understood why it is that some corals and other sea creatures fluoresce. What is known is that some marine organisms (such as corals, sponges, anemones, jellyfish,