BONFIRE
After the
fire was discovered, they were used to heat caves and cook food.
TORCH
A stick
wrapped in flax fibers impregnated with a flammable substance. Torches were
used to illuminate caves and dungeons under castles. They were not used in
living quarters because of poor ventilation.
OIL LAMP
A small
cup-shaped vessel with a spout, most often made of clay. Olive oil was poured
into the vessel and a wick was lit in the spout. Used in ancient times for
lighting. Later, oil lamps were made of other non-combustible materials.
CANDLE
Light
source used up to modern times. Most often made in the shape of a cylinder with
a wick sunk in the middle. The first candles were made of wax.
KEROSENE
LAMP
Invented by
the Polish scholar Ignacy Łukasiewicz in the 19th century. It began to be used
to illuminate rooms. The lamp consists of a kerosene container from which a
wick is led out. Most lamps have a transparent glass shade. For many years, the
kerosene lamp was the most popular light source.
GASLAMP
It was used
to illuminate public places, mainly on the streets. Due to the need for gas supply, it
was not used to illuminate apartments.
ARC LAMP
An electric
arc forms between the lamp electrodes, which is the source of the light.
Because its glow changes, the lamp is not used to illuminate apartments. There
is air inside the glass bubble. 
BULB
A glass
bubble filled with noble gases. The light source is made of hard-melting material.
The bulb emits light with a color similar to sunlight. The disadvantage of the
bulb is that only 5% of energy is used for light, the rest is converted into
heat.
FLUORESCENT
BULB
A gas
discharge lamp, usually two-electrode, working in the field of electric
discharge in noble gas (argon, neon, xenon, helium). A variation of the
fluorescent lamp is the high-voltage fluorescent tube, commonly known as neon.
MERCURY-VAPOR
LAMP
Lights up
as a result of electrical discharges inside a glass bubble. Mercury is used in
its construction. Used mainly to illuminate the streets. It emits ultraviolet
radiation. Less and less used nowadays.
SODIUM
LAMP
Replaces
mercury lamps in street lighting. Sodium occurs in its structure, hence the
name of this lamp.
FLUORESCENT
LAMP
Commonly
called energy-saving. It does not emit heat like a regular light bulb. As a
result of electronic ignition, the phosphor is stimulated to glow, which is
located on the inside of the glass bulb.
HALOGEN
LAMP
Similar to
a light bulb. Inside there is a gas with the addition of halogen. This lamp has
low energy losses. Often used for lighting apartments.
LED LAMP
Light Emitting Diodes are classified as semiconductor optoelectronic devices that emit radiation in the visible, infrared and ultraviolet light range.
Questions:
1. What will the light bulb look like in 100 years?
2. How do you save electricity?
3. From which yet undiscovered sources can we obtain the light?
Comments
1. What will the light bulb look like in 100 years... It's hard to say. I see it this way: it will be a small point the size of a pin, which will emit quite strong light (as we have leds in the room, for example).
2. Honestly, I don't save on electricity at all. Why? Because I use energy-saving devices (class A and up) and use LED lighting, which is more expensive but has lower energy consumption - and this translates into savings.
3. I have absolutely no idea :o
2. I don’t have any specific way to save electricity. I just try to be aware of my everyday activities and don’t waste energy when it’s not needed. I do regard what I’m doing and turn off the lights or TV when I’m not using them. I guess that’s all what I do to save energy, I’m sorry.
3. I have no idea man. How should I know? If it’s still undiscovered then maybe it’s better to ask this question some kind of scientist or something. :D I would like to have for example a little star kept in a jar as a source of light. That would be quite cool, though impossible.
2. I always unplug the electrical devices I am not using at the moment. The power strip which brings electricity to the computer and all things connected to it is always turned off for the night. Apart from that I try not to keep the fridge open for too long. To be honest, I probably do consume a lot of energy, because I always prefer to keep the performance of the computers as high as possible instead of saving power.
3. I don’t know, but maybe we’ll learn how to transfer the light from sources which are very far away, yet unlimited, like stars for example?
2. I don’t save energy and I don’t waste energy either. If I were to save energy I would first and foremost exchange my 100Volt light bulbs to more compact 40Volt in living room.
3. Well, there are some opinions that we could acquire energy from lighting during storm, but nobody has ever done it before, so it is undoubtedly impossible for some reason.
2. To be honest, I don't save electricity during the quarantine period. I am afraid for my bills, because practically 12 hours a day, my computer works at full capacity. In addition, I use energy-saving light bulbs, where I can put LED bulbs.
3. It seems to me that some of the marine plants glow in the dark, in addition, some oceanic fish are able to produce light (monkfish). I think new hitherto unknown chemical reactions may contribute to the formation of light.
I never though about that. Maybe we will have tons of holograms that will emit light.
2. How do you save electricity?
I turn off unused stuff like apartment lights and some kitchen device I left unplagged. I also try to use some candles as I am really starting to love the atmosphere of dim lighting during coding at night.
3. From which yet undiscovered sources can we obtain the light?
Propably from plants and fish. Some fish have something like light source a top of their head. Maybe we will be able to create something similiar tough more powerful in the future? Who knows.
I don`t know exactly. Sometimes we can`t know what the world will be like tomorrow and here are 100 years. Maybe light bulbs will hardly change. Or perhaps we will not need lamps at all and we can see with some kind of echolocation...
2. How do you save electricity?
To save electricity, I use energy-saving lamps, do not forget to turn off the lights when I leave the room. Just a few days ago there was Earth Day and a flash mob took place when people turned off the lights at home for a certain period.
3. From which yet undiscovered sources can we obtain the light?
I don`t think that I can answer you. Its question is more for physics and scientists. And if anybody knows the answer, he or she will not like to share it yet :)
2. I use only LEDs at home. I also use household appliances that do not consume much energy. Another thing is that I try to defrost the fridge as often as possible to get rid of the ice that accumulates on the ending wall in the fridge (I don't have no-frost one).
3. I don't understand the question. How could I describe it if the source hasn't been yet discovered? If I anybody knew that, it would already be discovered...
I hope that scientists will discover some unknown form of energy. And the light bulbs will be completely wireless. They won't draw any electricity. We'll call the sea some kind of lighting using luminescent bacteria. There are already attempts to build such lamps. I hope they'll succeed at last.
2. How do you save electricity?
I turn off the injuries I don't use. I heat water using natural gas. I use an energy-saving device. Maybe someday I'll have solar panels.
3. From which yet undiscovered sources can we obtain the light?
If it' s undiscovered, I don't know how I can use it.
2. I don't. I see no point in doing so. Most of devices I use are pretty energy saving by itself though.
3. Probably from those that generate energy in some way? It's a very hard and broad question to answer. But universe is so big that there are plenty of sources like that for sure.
It's hard to envision, when we look at what people thought the 2020s would look like just one hundred years ago it was completely different from our everyday reality.
It could be some form of intelligent device that would only light those parts that we look at increasing energy saving to a maximum.
2.
I save electricity by turning off the lights when I'm leaving a room and won't come back to it within minutes, also turning off devices that are in stand-by also saves some electricity.
3.
Maybe directly from the sun, not by using solar pannels on earth, but somehow placing them very close to the sun and transfering that energy via space to earth.
It's hard to know what you will look like in 100 years. It will probably consume less electricity and be more efficient
They will certainly give better light. Of course, probably everyone will be a smart bulb and you will be able to change colors
2. How do you save electricity?
Hmm, I replaced all the bulbs for leds, I turn off the monitors when I don't use them. When I leave the city for a long time
what I can unplug. Recently, I have also replaced a computer power supply with higher performance.
3. From which yet undiscovered sources can we obtain the light?
hmm I don't know I don't know. You can get light with chemicals. But I have no idea
I think about it as a new way of gathering energy. Maybe it doesn't need to be connected to anything and it will have an infinite energy.
2. How do you save electricity?
I save it by always reducing power in places that it doesn't have to work. For example turning off the light in the rooms i'm not there. When I use washing machine or dishing machine I just set it on lower rotation to consume less power.
3. From which yet undiscovered sources can we obtain the light?
I don't know, m first guest would be from chemicals as some of them glows. Maybe connecting these to fields of science would give us unlimited energy.
2. I don't save it in any special way except just not using it when I don't need it. Cause, for example, my neighbors always leave the light on everywhere in the flat. Irritating. But electricity is quite cheap and eco enough if you don't use coal.
3. They are called them undiscovered because nobody has discovered them, no? But okay, let's imagine that we will change our DNA in a way that we will produce light with our bodies when we will want to do so.
Good question. I think they will look simmilar to light bulbs that we use nowadays. Maybe they will become smaller and more bright?
2. How do you save electricity?
I'm going around my house and turn off all of the lights that my flatmates left on. I dont like unnecessary used lights. I also like sitting in semi dark rooms with only one desk lamp turned on and i have energy saving light bulb pluged in :)
3. From which yet undiscovered sources can we obtain the light?
Maybe something connected with nuclear split? Meybe in the future we will use uranium or polon made light bulbs.
It is really impossible to answer this question. I couldn't even answer it if was 10 years instead of 100. They might just get smaller with time and be more effective.
2. How do you save electricity?
I try not to have any devices on when I do not use them. It includes the light, speakers, tv etc. That would be pretty much it.
3. From which yet undiscovered sources can we obtain the light?
Well, I can't really tell, as the sources remain undiscovered :).
2. I like sitting in dark rooms, so I'm turing the lights on just in necessery moments. Also i really do enjoy candles so sometimes I'm using them as light source.
3. This question is quite strange - like undiscovered sources are called undiscovered for a reason?
Which how we are like right now in 100 years we will stop using light bulb anymore we will return to using candles and fire torch after WW3 technology will be lost and we will return to the time before electric. As Einstein said “I do not know with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.”
2. How do you save electricity?
I don’t do too much I simply turn off light when I leave the room and I use energy-saving light bulbs and other electronic and that’s it.
3. From which yet undiscovered sources can we obtain the light?
I would bet on genetic engineering it wouldn’t give us new source of light but it could change how we see and give us night vision then with this why would we need new source of light when we would see good enough without light.
Just like in star wars. Someone like a Jedi knight will send up a ball of light and it will illuminate the entire interior or room. Only if it will be called a light bulb, I don't know. Maybe "jedówka", "rycerzówka" or maybe flowing light.
2. How do you save electricity?
Quite simply, I don't turn on unnecessary bulbs. I turn off the TV at night, I don't leave chargers in contact.
3. From which yet undiscovered sources can we obtain the light?
Hard to say. Maybe from the energy quanta, I don't know. I think that scientists will soon find sources of wave emission appropriate for light and somehow it will be.
2. I just try to use as little electricity as i need to.
3. I have absolutely no idea.
2. Personally, I don't pay attention to energy saving products. I do not buy eco bulbs only because they have lower power consumption, but because they have a nice and harmless light color for the eyes. But when it comes to saving, for example, I don't leave turned on light the rooms in which nobody stays.
3. I don't know from which undiscovered sources we can get light from. Maybe because they are undiscovered.
2. By not using them.
3. I think there is enormous amount of possibilities in basic chemistry. I can bet on some gas sources or even liquid.
2. In the evening I enjoy sitting by dimmed lights, with some scented candles and music. I live by myself and I don't really watch TV. I always have in mind that energy saving is necessary for environmental care and I try to care for it.
3. I don't really know.
2.I do try to use as little light in the house as I can. But that's about it. Maybe I should read up on saving light a little more.
3.Maybe we could use the luminescence fireflies :D Or maybe obtain energy from different stars. Who knows?
I think there will be a lot different bulbs just like know. No one can know that but for sure there will be so small alternatives to normal bulbs.
2. How do you save electricity?
I dont. Coronavirus made me to be in front of the computer like 16 hours or more per day. Before that i wasn't to much at home. I was just sleeping there so i didnt use a lot of electricity.
3. From which yet undiscovered sources can we obtain the light?
You ask about undiscovered source. If someone would know that then it would be already discovered. ;)
Probably there will be some alternatives from chemical elements.
I don't know, I never study about this field, so I can just guess it, I think it will be not too much different until we will leave the electrical age and enter a new age.
2. How do you save electricity?
As long as I am using computer everyday, I can't say that I am saving electricity no matter how I try to save it on other things, but I am a programer, I have no choice, at least I am trying to use phone as less as I can since it is also one of daily electrical appliances that consume a lot of electricity.
3. From which yet undiscovered sources can we obtain the light?
Again I don't study this field so I don't know, maybe we can get it from chemicals?
2. To save energy I use energy-saving bulbs and try not to turn the light on when it is not necessary and turn it off as soon as I leave the room.
3. I have no idea, to be honest, I think we're already using all possible natural light sources for energy, but we can do it more efficiently.
It would be cool if we can find a way to keep natural light from the day and use it at night. I not sure how that would work but I would like it.
2. How do you save electricity?
I don't think I save electricity that much because I use electricity almost for everything. I think I just try not to waste it but switch off what I don’t need.
3. From which yet undiscovered sources can we obtain the light?
I'm sorry but I don't have a proper answer to your question but in plants maybe.
I think it can used levitation and magnetic field as hyper-loop is using it and develop their idea in real life. Also it could use light in fiber optics as it is quick and we have a lot of this sorce. Daylight is available, there is no need to use hard-to-gain energy to create artificial light.
2. How do you save electricity?
The easiest and the best way - just not to waste it when not using. It is very simple but a lot of people while living in the consuming era don't care about unplugging devices that they don't need.
3. I have no idea. Seriously. I don’t know, but maybe transferring the light from sources that are unlimited like DNA, stars or vacuum?
1. What will the light bulb look like in 100 years?
That's a long period for science in second milenium AD. I suspect it will be a thing that we can't even imagine right now. If you want me guess, I would say it's something that won't need to be directly connected to electricity (can produce it on its own or maybe 'capture' it from from wi-fi).
2. How do you save electricity?
My electricity usage currently is very low so there is not much space where I could optimize/save it. The only thing I explicitly do is turning off computer instead of putting it to hibernated state
3. From which yet undiscovered sources can we obtain the light?
As I mentioned in my first answer - that's probably electromagnetic waves from access points like wi-fi or telephone antennas
2. By not using it.
3. I believe there is no undiscovered sources left. Today physics give us pretty good idea what can radiation in the form of visible light and what can not. By the way visible specter is really not that big. Many thing produce radiation, yet only few we can see.
2. To save electricity I chose energy-saving devices such as dishwasher, washing machine or TV, also I have a habit to unplug unused chargers.
3. That’s a great question, when I discover one, I will tell you while receiving my Nobel price ;)
I didn’t even think about it. Maybe it will not be a light bulb at all. Maybe it will be some kind of nanoparticles that highlight particles in the air, so people can save electricity. Or something else from this series of developments. Or for example, just the walls in the houses will be covered with a special shell that accumulates daylight, and at night if you activate this substance it will begin to emit photons.
2. How do you save electricity?
I do not consider myself the one who does this consciously. But if you think and analyze some things, I still do. For example, I disconnect my devices from the mains when I do not work with them. I use electric saving lamps. And do not watch TV at all, for example, can this be considered?
3. From which yet undiscovered sources can we obtain the light?
To be honest, I did not quite understand the essence of the issue. How to describe what is not yet discovered? Or if you are talking about what new light sources we can still use, then this is more relevant to the first question.
2. I save electricity in such a way that I use energy-saving light bulbs and also do not use excessive electricity. I also exclude unused electronic devices from contacts.
3. Honestly, I have no idea. I am not fluent in this topic so I will not invent.
2. I use public transport even though I could use car. I have solar panels on the roof. I turn off the light when I leave a room
3. From potato.
I don't think there will be much of a difference.
2.
Turn off lights when not in use, make a habit of turning off lights when leaving a room, etc.
3.
Humans are very creative creatures and someone, somewhere will probably figure out some new way to make light even if most of us can't fathom it right now. Even penicillin was found by accident, I'm sure with any new light source it will be the same.
2. I've never think about. Even at night I can sleep with lamp on. However my parents always care about it is kind do not turn on anything while you don't need it.
3. I have no idea. Maybe from natural phenomena like lightning or volcano. It might sounds strange but who knows
2. I made my own, small power station, empowered from solar panels. Also, I’m trying to switch off the light if I know that I’m living my room for more than 15minutes.
3. From stars. There was such a project, similar to Starlink – let’s send satellites close to the sun and use this energy much more efficiently!
2. I always try to turn off every device when I don't use it. I turn off lights when I leave rooms. I try not to turn on light during the daytime. And I do this not only in my house but everywhere I go.
3. If I knew it, I'd probably be kind of rich in the near future 😅
Maybe like I mentioned before, we will invent some new gas which was never known before.
I guess that light bulbs might not be a thing in 2120. I think that light sources would have a different form than they do now. I imagine them as a separate light particles which would fill the place instead of being emitted from one source. Something like a light fog.
2. How do you save electricity?
I have this custom of turning off every unnecessary light whenever I can. I guess that this is a good habit which counts. I also keep my monitors dimmed or turned off whenever they are not needed. Any electrical device which is not needed at the moment is not working in the background.
3. From which yet undiscovered sources can we obtain the light?
I can only guess what the author had in mind, so let's keep the idea I had at the beginning. Particles might be the future of light. No separate light source but a fog of illumination which would fill places with.
2. electricity can be saved by switching off the devices at night, using special energy saving modes or by buying batteries that can be recharged many times
3. obtaining light has not yet been discovered from the rocks
I don’t know, I think that it shouldn’t really change. Right now, there are so many different shapes of light bulbs that we can buy without any problem, that fit any kind of lightshade or chandelier and we don’t need to invent anything new in particular. The only thing that can change is decrease in the power consumption.
2. How do you save electricity?
I tend not to forget lights once I leave the room and I buy energy saving light bulbs. I know that photovoltaics is on the rise right now. I’d probably invest in that if I had a house.
3. From which yet undiscovered sources can we obtain the light?
I don’t know as it’s undiscovered or the question is mistakenly constructed :).
I have no idea what the 100-year light bulb will look like, but it is very likely that it will be wireless or will draw energy from the air.
In my home, energy is saved in many ways, including energy-saving light bulbs, switching off the light when not in use, not using the light in the house when it is bright outside etc.
I am almost sure that air is a resource that humanity has not yet discovered, from which we can derive many benefits, e.g. create light from it.
In my opinion there are two possibilities. Both of them would be very effective in terms of power needed, it would need much less power than nowadays bulbs.
a. It will hold some quite stable chemical process.
b. It will be very similar to LED light.
2. How do you save electricity?
I turn the lights off when I'm leaving a room. I turn my computer off when I am finished with my work. I try to not use electric devices more than I need to.
3. From which yet undiscovered sources can we obtain the light?
I would think of some chemical processes, some of them similar to those that take place on Sun.
There will not be light bulb. You will get eyes surgery like Riddick from Pitch Black movie.
2. How do you save electricity?
I use energy saving light bulbs.
3. From which yet undiscovered sources can we obtain the light?
Genetically modified fireflies, maybe?
https://www.youtube.com/watch?v=k72jGJTC_3o
Our world is developing really fast even now, so in my opinion, after 100 years standard light bulb will be completely useless. Nowadays, they are less and less used in public buildings and human houses and others.
2. How do you save electricity?
I use the energy-saving bulbs and I try to use only needed amount of electricity.
3. From which yet undiscovered sources can we obtain the light?
Maybe from some biological sources? I mean, in the Earth we have a lot of animals' species which are producing light in their own bodies. e.g. some frogs, fish and of course fireflies.
2. Sadly, I don't, I'm too lazy for it, but If I wanted to start, I would probably turn off my computer when I'm not using it and unplug my phone from a charger as soon as it is fully charged.
3. Interesting question, if anyone in this thread can give an answer to that they should patent it and become a millionaire.
Probably something smaller, and more efficient that the LED. But if I would know exactly I would just sell the idea. According to the science-fiction movies, you just need to add nano to the technology, and you've got the technology of the future. So nanoLED© maybe.
2. How do you save electricity?
I keep it simple - I just try to remember to switch off the lights for the night. Also, I do always switch off the computer once I am done with my work.
3. From which yet undiscovered sources can we obtain the light?
I don't know. Maybe if we truly understand and master the energy fusion, it would become so cheap we could have a mini reactor on the shelf, which would brighter the room.
I think it would be some kind of device similar in appearance to LEDs. I will be probably much smaller and more energy-efficient. I think it would also be powered by renewable energy may be from the light in the room during the day when it's off.
2. How do you save electricity?
I try to save electricity, by not keeping my devices in standby mode. I also try to turn off the light in rooms in which it isn't needed.
3. From which yet undiscovered sources can we obtain the light?
I have no idea, as they are undiscovered ;) I think maybe some bio fluorescent bacteria could be used in the future.