Diving with underwater lighting
Aesthetics and functionality are two of the main reasons why underwater lighting is used.
1. Artificial lighting is used as during a dive, warmer colours of the spectrum are no longer visible at a depth of several metres. The first to vanish is red, followed by all the other colours of the spectrum the deeper you dive. At greater depths, below 30 m, the image is greyish blue. In order to document the true beauty of the undersea world and experience the depths in their natural colourings, divers need to take diving torches or flashlights.
2. Artificial lighting is used during night dives and for dives with low visibility, such as cave dives and wreck dives. Aside from its primary function, that of illumination, artificial lighting facilitates underwater communication; for instance, hand signals agreed beforehand during night dives. It is important that, alongside the main light, divers should also have a small backup torch or flashlight.
Other sources of light during dives are strobe lights and position-indicating beacons, which have an intense light, are visible from a great distance and are usually worn by divers to indicate their position, or are attached to buoys as surface markers during night dives.
Lighting used by divers varies from hand-held torches and flashlights to highly complex systems used for cave and wreck diving where the energy source is connected to the light by cable and only the light source is held or attached to the helmet.
We differentiate sources of light. The once popular halogen bulbs have been replaced by HID and LED technology; the latter is more popular among divers due to low consumption and high illumination.
No matter how small the flashlight, attach it to your buoyancy compensator with a rope or snap-link to ensure it is always at your side and that your hands are free.