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We really liked this light but it was a little garish for tech divers - silver color with purple trim - so we asked I-Torch to do our version in an all black anodized color. They still ship it with the purple o-ring trim but we include a set of black trim o-rings (pictured) so you have a choice. The high quality lens and bright light output makes the tight beam from the I-Torch Advance-B one of our favorite choices as a technical backup, and it is also our recommendation as an excellent sport diving primary light. |
Tek Tip
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Candela vs LumenThe unit of measure commonly used to describe the intensity small LEDs is the millicandela (mcd), 1000 millicandela equals 1 Candela. The Candela rating is an expressioin of how much light is produced as measured at the light source. The candela is the Luminous Intensity, in a given direction, of a source of monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. The unit of measure commonly used for most other light sources is the Lumen. Lumens are units of Luminous Flux and they measure how much light actually falls on a surface. The Lumens from a light source is equal to the Luminous Intensity (Candelas) multiplied by the solid angle over which the light is emitted, taking into account the varying intensities in different directions. Because of the variations of beam intensity by direction in LEDs, as a practical matter there is no straight forward way to mathematically convert between Candelas and Lumens. |
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