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LED (light emitting diode) - are very durable, efficient and powerful. HID (high intensity discharge) - are extremely powerful and have a nearly white beam. On the downside, HIDs are very delicate and quite expensive. [7] A modern dive light usually has an output of at least about 100 lumens. Bright dive lights have values from about 2500 lumens.
Underwater writing slates and pencils are used to transport pre-dive plans underwater, to record facts while underwater and to aid communication with other divers. Dive lights , which are usually waterproof and pressure rated torches or flashlights , are essential for safety in low visibility or dark environments such as night diving and wreck ...
A glow stick, also known as a light stick, chem light, light wand, light rod, and rave light, is a self-contained, short-term light-source. It consists of a translucent plastic tube containing isolated substances that, when combined, make light through chemiluminescence. The light cannot be turned off and can be used only once.
Normal requirements for night diving are a dive light, and adequate protection from exposure. [1] Some precautions and skills for night diving include: avoiding shining the light in other divers' eyes, to be aware of and use surface light signals for bearings, and if appropriate to use an illuminated shotline buoy. [1]
Communication is central to buddy and team diving. DIR divers must be competent at underwater communication by hand signals and light signals, and to use them to ensure that they are always aware of the status of the rest of the team. DIR divers have an extended range of hand signals, some particularly relevant to overhead and decompression diving.
Canister lights allow the light head to be held in either hand, on a Goodman handle, or looed over the neck to free both hands, and the cable prevents the light from falling far if dropped. It is possible and fairly common to carry more than one of these options. Where light is important for safety, the diver will carry backup lights. [100]
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