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This is a traffic light.

The green light allows traffic to proceed in the direction denoted, if it is safe to do so and there is room on the other side of the intersection.

The amber light warns that the signal is about to change to red. among them the a phase during which red and yellow are displayed together indicates that the signal is about to change to green.[4] Actions required by drivers on a yellow light vary, with some jurisdictions requiring drivers to stop if it is safe to do so, and others allowing drivers to go through the intersection if safe to do so.

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1) Find the column which has your register number.
- Type your name and register number in the title.

2) Post a picture or video of a light source that you see around you.
- you can obtain the image from Google image or be creative, take pictures from your surroundings!

3) Share with the class
- the name of the light source that you have posted
- how the light source is beneficial for us.

4) Scroll to the right most end of the page to answer the bonus question.

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1) Post a picture of an animal that can give out light on its own.

2) Where can you find this animal?

2) Explain how is that animal able to give off light?

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This is a selfie ring light which helps to brighten up the faces of those who wish to take selfies in dimly lit places.

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These are "Glow in the Dark Sticks". It is useful in dark places when you do not have any lights or candles with you. It is also very safe to use as it does not involve fire.

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This is a motion sensor light. This can be used in dark places. It will light up when someone walks past it.

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This is a blue jellyfish. It has organs that emit light from its transparent body. It lives in the ocean.

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This is the sun. The sun gives of its own light.It can help us to see things clearly.

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This is the Exit signage. During emergency, we follow the signage to lead us out to safety.

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This is a glowworm. A glowworm is the larvae stage in the lifecycle of a two-winged insect. It grows as long as a matchstick and looks a bit like a maggot. A glowworm uses its glow to attract food and to burn off its waste. It's tail glows because of bioluminescence, which is a reaction between the chemicals given off by the glowworm and the oxygen in the air. This chemical reaction produces light, which the glowworm can control by reducing the oxygen to the light organ. Insects fly towards the light and get stuck in the sticky lines that the glowworm hangs down to catch food. Glowworms also use their glow to put other creatures off eating them.

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This is a cookiecutter shark.It can be found in the sea.It’s gills are covered with photophores and that makes it give out light on its own.

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This is a torch light.It is useful for camping or when there is a blackout.

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The Sapphirina or sea sapphire is a small, parasitic crustacean or copepod. Tiny and transparent, this creature is found in the marine environment all over the world. These animals don’t glow: the sparkle. The reason behind this is the iridescent, crystal plates inside the epidermal cells which catch light and reflect it back. Different species give off different colours of light, including golden, blue, etc. This display of luminescence is only in case of the males who probably use this as a way of attracting the females. They light up, and within the blink of an eye, they are gone, creating the most stupendous experience ever for the observer.

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These is a street lamp, it is useful in dark places on the road. It helps drivers see on the road and prevents accidents from happening.

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Match sticks can be used to light the candles on birthday cakes when there is no lighter.

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A scorpion can give out its own light. All scorpions fluorescence under ultraviolet light, such as electric black light or natural moonlight. They can be found in Brazilian forests, British Columbia, North Carolina and even the Himalayas.

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This is a Crystal Jellyfish.It gives out its own light. It can be found at open waters .The animal would gives of light from its body.

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An angler fish are marine fish found in all the oceans of the world at depths of 50 to 100 metres . The angler fish can extend both its jaws and stomach to an incredible size, allowing it to swallow prey twice the size of its entire body. The dorsal appendage is a lure called an esca or illicium that gives off light produced by symbiotic bacteria. The males of the species are reduced to a sperm-producing parasitic appendage of a female . this is called parasitic mating where the male angler fish attaches itself to the female angler fish by biting into the female's skin and using enzymes to fuse with a female . a female angler fish can carry as many as six parasitic males. All angler fish are carnivorous and they range in colour from dark grey to dark brown. their length can vary from 20 cm to more than a metre . They can weigh from 2 to 45 kilograms. The angler fish is caught is always a female because the male angler fish will spend the rest of its life joined to a female angler fish like a parasite . The two become fused together and their blood vessels will join as one. The angler fish's nickname 'Black 🤬 Fish ' due to its ugly appearanc

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This is a lighthouse, it is a tower with bright light at the top located at a place for navigation purpose. It serves as a navigational aid and to warn boats of dangerous area. It is like a traffic sign on the sea.

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This is a lighter. It is useful for lighting candles for celebrations.

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This is a car's headlight. The car uses it to signal cars in front and at the back whether it is going to filter left or right to prevent accidents.

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This is a Clusterwink Snail. It lives at the Eastern Australian Coast. It has a pair of organs that give off a bright glow.They sit underneath the hard shell and can't be pushed outside.The light not only finds a way through, it also diffuses throughout the shell so that the entire structure starts to glow.

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This is a Chordata, found in the Eastern Pacific Ocean.It has closed circulatory system.A system which the oxigen carrying blood cells never leave the blood vessels。

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This is a Luminous Click Beetle. It is  found in tropical areas of the Western hemisphere in countries like Brazil and Mexico.It can produce two different colors of light in its body; underneath its body it emits a yellow light and on the top its headlights glow green.

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This is a table lamp.It is useful for close up work.

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This is a lamp . When there is a blackout we can on the lamp so that we can see.We can also use it as a table light to do work when it is dark.

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This is a firefly!It can be found at North and South America.It lives also live near the pond.It gives off light by its emmiting organans .

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Watch: Fireflies Glowing in Sync to Attract Mates | National Geographic

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This is a squid . It lives in the western Pacific Ocean.The reason behind glowing a beautiful blue color is its body covered with photophores and by glowing light it actually communicate with other Firefly Squids. The light is produced due to a chemical reaction, bioluminescence (the production and emission of light by a living organism.

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This is a bicycle that is lit up by a light source.At night,this can alert the passer-by to beware of the bicycle and can prevent accidents to occur.

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These are glowing shoes.They are served to warn the drivers of the joggers on the road at night.

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This is a headlight of a car.It helps drivers see in the dark

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Lamp post is place by the side of the pavement,so when it is dark the lamp post will turn on to let the people see where they are going.

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fire is a source of light that allows us to see in the dark .For example:when you are out camping fire can help you cook your food ,allows you to see in the dark ,scare away animals and brighten up you'r camp

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The ability to produce and emit light in the dark biochemically is called bioluminescence, and it is one of the most fascinating phenomena in the nature. While it is beautiful to look at for an observer of glow-in-the-dark creatures, bioluminescence is actually used by many creatures as part of their survival, defence and preying strategies as they use this natural 'cold' light to attract their prey or mates or distract predators. Humans, too, have enlarged the list with some unlikely creatures, using the advancement of science. Let us find out about such glowing animals:

1. Firefly

There are more than 2000 varieties of fireflies, found in temperate and tropical environments. Also called lightning bugs, they have specialized light emitting organs below their abdomen. They produce light of different colours, like yellow, green, or pale red, and emit the light in blinking patterns to attract mates. The light is also a sign of its unappetizing taste.

2. Jellyfish

Jellyfish is another very well-known luminous creature. With the help of fluorescent protein, photo-protein and other bioluminescent proteins, this glorious animal can create the most beautiful underwater scenario as it emits a glow from its otherwise transparent body. That's why, it is a favourite animal for display in public aquariums.

3. Cookiecutter Shark

The cookie cutter shark, which barely comes to the surface of the sea, has a unique way of eating: it cuts off cookie-sized chunks of flesh from the body parts of its prey. The ventral part of its dark brown body is thick with cells that emit light a cold light. This light combines with the dim light filtering from the sky and blurs the familiar outline of the shark in the sea.

4. Clusterwink Snail

While glowing snails exhibit bioluminescence in the form of dim flashes in the head-foot region, the clusterwink snail is the only snail that flicker their shells like little light-bulbs. The spiral shells emit a blue-green glow in flashes as a form of self-defence. Actually, it is the shell that amplifies and diffuses the light which is produced from a single mushy spot of the snail's body. This light shocks the predator, and even attracts the predator of the snail's predator.

5. Bioluminescent Bacteria

Some bacteria, which live in the marine environment or the decomposition or guts of sea creatures, have the capability to produce light. Many animals live in symbiosis with these bacteria, and, in return for shelter and nutrition in their bodies, use their bioluminescence. The Angler fish, for instance, has bacteria living in its barb-like escae, which glow to give using their bioluminescence. Flashlight fish have bacteria residing in the small organs beneath their eyes while the Hawaiian Bobtail Squids give shelter to such bacteria in their mantles.

6. Arachnocampa Gnats

Also known as the New Zealand Glowworm, this fungus gnat is a luminescent creature that dwells in wet caves, humid forests and grottoes. The caves, one of the most famous being the Waitomo, are infested by these worms who form a glowing canopy as they stick to the ceilings or walls of caves, or form glow worm threads.

7. Sea Sapphire

The Sapphirina or sea sapphire is a small, parasitic crustacean or copepod. Tiny and transparent, this creature is found in the marine environment all over the world. These animals don't glow: the sparkle. The reason behind this is the iridescent, crystal plates inside the epidermal cells which catch light and reflect it back. Different species give off different colours of light, including golden, blue, etc. This display of luminescence is only in case of the males who probably use this as a way of attracting the females. They light up, and within the blink of an eye, they are gone, creating the most stupendous experience ever for the observer.

8. Scorpion

Scorpions are neither bioluminescent nor iridescent, and they do not glow with the help of bacteria, either. They glow when exposed to ultra-violet lights of certain wavelengths. They give off a bright blue-green fluorescence under 'black light' and also if there is enough moonlight. Though the real reason or use of this fluorescence is not yet known, but, scientists are starting to believe that since scorpions do not like and even UV lights, they probably use this mechanism to gauge the level of light, and hence determine whether or not to come out and hunt. Of course, there could be other uses, too, like recognizing each other.

9. Firefly Squid

One marine creature that puts to rest the act of bioluminescence of all other creatures is the firefly squid or sparkling enope squid. Every year, off the coast of Japan, the firefly squids are observed to give a fascinating light show. It uses its light-producing organs called photophores which emit a deep-blue light that can be flashed on and off in unison or in various patterns. These predators flash the light to entice their prey, and also to attract mates or confuse their predators about their shape. They are seen to gather in the Toyama Bay during the months of March to May, which is their mating season. Many spiders and insects possess this ability, as well.

10. Man-made Glowing Animals

Scientists have used the sophistication of modern technology to engineer genetic alterations in different animals, like cats, pigs, sheep, fish, cow, etc. and made them into luminous creatures. According to scientists, this can help to create animals with human diseases so that those can be studied properly, and also to improve their production, as well as the quality of the products we obtain from them so that they can be better resources to human consumers.

The natural glowing mechanism comes from various methods like bioluminescence, iridescence, etc. and these mechanisms are heavily inspiring people into developing path-breaking inventions, and the glowing animals are becoming the source of the natural cold light for scientific studies.

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10 Spectacular Glowing Animals - Wonderslist

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The ability to produce and emit light in the dark biochemically is called bioluminescence, and it is one of the most fascinating phenomena in the nature. While it is beautiful to look at for an observer of glow-in-the-dark creatures, bioluminescence is actually used by many creatures as part of their survival, defence and preying strategies as they use this natural 'cold' light to attract their prey or mates or distract predators.

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This is a candle. It is normally used on special occasions, such as birthdays. A candle can be put on a birthday cake to make the cake look nicer.  A candle can give off its own light when it is lighted by a lighter. During a blackout, candles can be used as a light source to enable us to see in the dark.

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This is the Aeroplane Strobe light and Beacon light.It provides visual for Control tower and other aeroplane in the air for prevention of air collision.

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Fireflies produce light through an efficient chemical reaction called chemiluminescence that allows them to glow without wasting heat energy. For fireflies, 100 percent of the energy goes into making light; and accomplishing that flashing increases the firefly metabolic rates an astonishingly low 37 percent above resting values.

Fireflies are bioluminescent, which means they are living creatures that can produce light. That trait is shared with only a handful of other terrestrial insects, such as click beetles and railroad worms. The light is used to attract prey and members of the opposite gender, and warn off predators. Lightning bugs taste bad to birds and other potential predators, so the warning signal is a memorable one to those that have sampled before.

Fireflies can be found in Singapore too. It can be seen in the forest.

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This is fireworks. It is seen during festival to celebrate the festival.

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New year's eve fireworks in the sky photo by Roven Images (@rovenimages_com) on Unsplash

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Download this free HD photo of fireworks, sky, night and celebration by Roven Images (@rovenimages_com)

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This is a television it gives of its own light when the switch is turned on. It can show cartoons and movies on it to make you less bored.

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A stove with a standing pilot has a small, continuously burning gas flame (called a pilotlight) under the cooktop. The flame is between the front and back burners. When the stove is turned on, this flame lights the gas flowing out of the burners.

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Kdys Tan (14)

Bioluminescent Bacteria

Some bacteria, which live in the marine environment or the decomposition or guts of sea creatures, have the capability to produce light. Many animals live in symbiosis with these bacteria, and, in return for shelter and nutrition in their bodies, use their bioluminescence. The Angler fish, for instance, has bacteria living in its barb-like escae, which glow to give using their bioluminescence. Flashlight fish have bacteria residing in the small organs beneath their eyes while the Hawaiian Bobtail Squids give shelter to such bacteria in their mantles.

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Lava is molten rock generated by geothermal energy and expelled through fractures in planetary crust or in an eruption, usually at temperatures from 700 to 1,200 °C (1,292 to 2,192 °F). The structures resulting from subsequent solidification and cooling are also sometimes described as lava. The molten rock is formed in the interior of some planets, including Earth, and some of their satellites, though such material located below the crust is referred to by other terms.

A lava flow is a moving outpouring of lava created during a non-explosive effusive eruption. When it has stopped moving, lava solidifies to form igneous rock. The term lava flow is commonly shortened to lava. Although lava can be up to 100,000 times more viscous than water, lava can flow great distances before cooling and solidifying because of its thixotropic and shear thinning properties.

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This is a candle
It gives off light when lighted up. It is very useful as it does not require electricity. It helps us to see clearly when there are blackouts

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 Keith Teo (15)                                    

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 Keith Teo (15)                                    

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This is a firefly.
It can be found mainly in the United States. Some firefly species are also found in Kansas although there are very less. It can also be found  in tropical Asia as well as Central and South America.
Fireflies produce a chemical reaction inside their bodies that allows them to light up. This type of lightproduction is called bioluminescence. ... When oxygen combines with calcium, adenosine triphosphate (ATP) and the chemical luciferin in the presence of luciferase, a bioluminescent enzyme,light is produced.

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This is a Antarctic Krill. The Antarctic krill are among the most important animals in the Antarctic food chain, ranking right under the phytoplankton on which they feed. When krill congregate in an area (called a swarm) during the warmer months, animals from all parts of this bitter cold region get ready for a feast. This is because krill affects life from every angle in Antarctica. Krill densities can reach as high as 30,000 individuals per m³! That’s a lot of krill and food for predators. With krill comes hungry fish that are gobbled by species such as seals, penguins, and birds. Krill have numerous organs which can glow a yellow-green light for up to 3 seconds at a time. It is not known exactly why krill glow, but it is thought by some scientists that krill illuminate to avoid predators from the deep by blending into the brightness of the sky and ice above the surface. As important as krill are in the food chain, it would make sense they developed such a tactic to blend in and try to avoid the inevitable.

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A torch will help to see clearly during a blackout.

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Marcus ng (22)

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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" originated as an acronym for "Light Amplification by Stimulated Emission of Radiation".

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This is a light bulb. It is used in houses to help people see things.

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This is a ceiling light, we need to switch on to connect to the electricity to give out light when it is dark at home so that we could see things around us.

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A light bulb helps people to see things around them when it is turned on

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The lamp is a light source that helps people read in the night at home.

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Laeticia (37)

US scientists have recently discovered bioluminescent millipede and have suggested that these light emitting creatures developed a brighter glow gradually over time. These millipedes may have begun to glow initially in response to living in a hot, dry environment, and then later used their glow as a warning signal in other habitats, shedding light on the evolution of bioluminescence.

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The candle is a light source that helps us see during a black out

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Dayven Lai (8)
Lightning  is a bright flash of electricity produced by a thunderstorm.Within a thundercloud, many small bits of ice (frozen raindrops) bump into each other as they move around in the air. All of those collisions create an electric charge.

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Neon lights attract passer -by "s . Mostly are for shops

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Nicole Ng(25)

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A led light uses light can be used to decorate for a party or in ur room .it will help if ur scared of sleeping in the dark by yourself

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explosivesThe spark from a loose contact or the movement of the switch, and even the heat of the bulb can be enough to ignite a flammable atmosphere. In an explosion prooflight fixture,

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This is a torch light . It is easy to carry and hady during a blackout at home.

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Stars shine because they are extremely hot. ydrogen is being converted into helium, a process which gives off energy that heats the star.

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Studio lights can help light up pictures and videos.

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a star gives of light to let us see at night.