Fluorescence Diving in Bali

Fluorescent dives

What is it and why do coral reefs and living critters underwater do it?

Fluorescence Diving is also known as fluo diving or glow diving. The absorption of energy by a material (specified : living tissues or marine organism of coral reefs and in the critters body) and it’s emission with a longer wavelength.

This shouldn’t be confused with phosphorescence, where the energy from light is stored and then re-emitted over a longer time (such as your dive gauge glowing in the dark after you torch it), which is therefore not the same.

Also Fluorescence is NOT  the same as bioluminescence too, if you know about the phytoplankton glowing in the waves offshore.

This phenomenon also happens in living organisms but in addition to and in minerals.  Do you know the crystalized rock type of  calcium fluoride such as “Fluorite” or “fluorspar” ?

When this material is heated, it is generates thermoluminescence, thus growing the “fluorite phosphorescent effect” as we known glowing in the dark

The most effective wavelength for elating fluorescence corresponds with the wavelength that diffuse best through with water. This is sort of not at all a coincidence, though, but more an adaptive  adjustment  of marine creatures and organisms to the homes  of their aquatic habitats.


Fluorescence can be found in all of corals, barnacles, sponges, anemones, jellyfish, clams, nudibranchs, cephalopods, shrimp, crabs and fish too.  It should present some benefit  for the marine creatures to.

As yet, not a lot of scientific vocation has been performed into the area. However, some research counsel that fluorescence in corals might act as a sunscreen, defending them, Specially in requires ow water, from UV radiation. Another hypotesis says, is that fluorescence let  the corals turn into the only light to them “the blue light” into wavelengths that requires to their symbiotic algae to photosynthesise. This could allow them to live deeper than the other corals that do not fluorescent

Can you imagine? that most of the fishes and marine animals use fluorescence to be able to camouflage and being unite into their background, such as into the fluorescing corals. Another interesting study says, fishes use red fluorescence to communicate and change their color to communicate, intimidate or hide from predators, or even to attract mates.

For example, if you have ever seen on dives such as octopus, squid, cuttlefish. They use fluorescence to do it for their secret and personal communication to others!

Coral Fluorescence

Coral fluorescence might be used to evaluating the healthy reefs. Reef check program done by using a laying line or gradient card to identify the coral species covered there

But researchers may as well as have the opportunity to look how healthy is a reef by utilizing fluorescence torches. Dead corals would not fluoresce, algae overgrowth would fluoresce in red, and illness or areas of dead corals may be noticed too.

A current find out about stress corals will fluoresce less. Different temperature of water, exposing to the heat and cold showed decline in fluorescence.Also, new coral population, these tiny colonies and generally clear coral which you couldn’t see with the bare eye can be spotted easily with the fluoro light.

This new habitat can be a key indicator of how healthy the reef is.


Before, divers used a UV light to see fluoroscence.

Since 1993, however, blue and ultraviolet LEDs were developed, and their costs had been losing in the late couple of years – plus they’re way more environment friendly and more straight forward to use with than using a white light with a filter back then.

But there may be a constraint  to blue light in place of UV light, then again – or not seen to the human eye. Blue light without difficulty outshines the weak effect of fluorescence. To parry  this, a yellow s filter is used  by the scuba diver on the mask. This yellow filter mask blocks the blue light from the torch and letting the  fluorescence (which has longer wavelengths) through.

Also, under the low light condition, if you have your underwater camera setup, there will be an manual adjustment to the light sensitivity in the camera setting also pair it with a special yellow filter in front of your lens or housing.

Marine Organism

There are some considerations in many diving group that a strong UV or blue light torches may damaged  the coral and marine organism. In fact, all night dives raise  this threat  – any light might disturb marine life, or interrupt  their behaviour, or put them vulnerable  to predators during the night dives.

Not that fluoro torch could cause substantive  damaged underwater –  the light spread covered wide and not on one spot and mostly only a few seconds at most on one point.  The energy levels from the torches are lower than those from natural UV sunlights.

Night Diving

You may experienced in the night diving, have some knowledge and experience of navigation to try this fluoro dive, otherwise some of divers might feel disoriented and not use to the complete dark environment, also a good buddy system is the most. Even during the dive we will try as maximum as we can to reduce the white light from your diving torch, so that only the blue light will torch the corals.

Many of the creatures are well hiding or master in their camouflage, and has a simple color or transparent in their body and really a challenge to identify during day dive. They will shine uniquely and amazed you during a fluoro dive and easily spotted under the blue light.

Dive only in the average of 5 – 10 meters and many things can be seen, the healthy marine life and best variety of corals can be seen beautifully in the shallow, you don’t need to dive deeper for fluoro dive.

Recommended links to read about the fluorescence

Experience more about fluorescence with us on a night dive in Bali.

Fluorescent dives in Bali

Fluorescent dives or “fluo diving”  are in addition to and referred to as “fluoro dive”.  It’s what occurs with a special underwater torches that emit fluorescent light during night diving, to s It’s become popular recently, dive into the new dimension of nocturnal sea.

Using a blue light and a yellow filter to reveal the fluorescence of the coral reef and creatures at night dive, we have limited pairing set for Fluoroscence Dive in Bali


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