Why Induction Lighting?

Why Induction Lighting?
meixia liAsked:
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What do you mean by induction lighting? At what exactly do you refer?
For example I have seen fluorescent tubes without cathodes. It was a circle or oval completely closed.
To start such lamp there was  and inductor, I do not remember 1 or 2, across the tube which generate pulses and accelerate the ions inside to maintain the current. I forgot also the start process, but I can find out.
The idea of such tube is very long life time.
A normal fluorescent tube fails when the filaments from cathode are broken seen by black ending of the tube or when there is leaking in the gas inside the tube. That is the common tube.
There is also the tube with single pin as enduing and uses high voltage/frequency to work. One example is in laptops with LCD and fluorescent tube 2mm diameter at the bottom of the LCD. The tube dies when the cathodes are consumed or the gas inside is slowly lost.

An inductive fluorescent tube without cathodes has a very long life time.
The disadvantages: is expensive, can be only round as circle, must be closed, not easy to be driven.

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Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
There's an article here explaining the differences between led and induction lighting. I'm afraid I haven't read it as it is a bit long and the font is tiny on my phone. I think it is from a good source though so should be some help.
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
this link shows five reasons why it isn't a good idea;
expensive, nasty emissions, won't work well in the cold, poisonous and possibly overheating.
it's enough to put me off, I'd rather have an open fire in the middle of the room and a hole in the roof for a chimney.
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It is not a trusty source.
At "3. Overheating - If the generator overheats the bulb will fail. Some bulbs are poorly designed and do not provide adequate heat dissipation. These bulbs fail after 15,000 to 30,000 hours."
You can say that about any listing system, even with LEDs if they are "poorly designed and do not provide adequate heat dissipation."
At "5. Mercury -  Induction lamps use electromagnets or a magnetic antenna called a power couple to energize solid mercury inside the lamp bulb. The mercury produces ultraviolet light which strikes the phosphorus coating. The phosphorus converts the ultraviolet light to visible light."
That is valid also for normal fluorescent tubes.

Better sources here:
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
From your first link they are bulky, expensive and emit rf radiation.
Maybe if they work on the idea a bit the lamps will be useful, but I haven't seen anything promising so far.
They are not common indeed because they are expensive and RF may interfere with near by radio devices. But in terms of lifetime seems better than preset LEDs. Probably the limitation comes from their driver, similar as for LEDs electronic power supply, which has a lower lifetime than the lamp itself.
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
It's never been a hardship changing an incandescent bulb, nor expensive until recently.
What I've always noticed on changing them is how bright the new one is compared to the one I have been used to. I'm guessing that there is a gradual reduction in brightness throughout the bulb's life. A long lasting bulb does not interest me for that reason. You could spend several years squinting under a bulb running half the brightness it was when new.
I worked couple of years in factory to produce incandescent bulbs. I could tell a lot about it. Then some years in a factory where the fluorescent tubes are manufactured. Now I deal with LEDs. In Europe there is pressure from European Union to go towards SSL (Sold State Lighting). I participate to different seminars, presentations. There is too much to tell. All sources of light reduce their brightness as the time passes, including LEDs.
The big fuss in Europe about lighting is saving energy, enough brightness and long lifetime. That's why is forbidden by law to produce incandescent lamps with power >=100W. And the demand from EU, since couple of years, is to eliminate more, especially class D, incandescent, halogen  and replace with LEDs, including street lighting. Nobody asks the persons, individuals what they want. It is just done. The same was when energy saving lamps were a big boom as now LEDs. There are millions of euros invested in research for LEDs and OLEDs for lighting.
I personally like the old incandescent bulb or the halogen bulbs with higher efficiency, only die to the light spectrum. The energy saving lamps, fluorescent and LEDs have narrow spectrum and is not nice for the eyes. Only a complex combination of LEDs with different color index, light temperature and proper diffuser will give a wide spectrum for light nice for the eyes, but not a simply LED bulb.
I do not want to enter into details, because are too many, staring from standardization of lighting, trends and who is behind, what drives all these changes, but I know enough, because I moved into these circles in the past.
For example, here is the imposed trend in EU:
And if you really want to see the new inventions in lighting, maybe a future trend when the price will drop, then have a look here:
Thibault St john Cholmondeley-ffeatherstonehaugh the 2ndCommented:
I was happy initially to try new bulb types to 'do my bit' to save the planet. I spent about 15 times the price of a normal bulb on a chunky looking  coiled fluorescent type bulb an fitted it at the top of the stairs where we always leave it switched on overnight. After a short time, 3-4 weeks, it started taking minutes to reach its sorry looking dim brightness. No use when you've just arrived home and want to use the stairs!  I started carrying a small torch with me for short trips up and down the stairs, not really 21st century living. The bulb itself died after about seven months, much sooner than the nine years promised.
Later I tried a very expensive led bulb in a down lighter fitting, as you said the colour spectrum was uncomfortable. This bulb died after about two months, the incandescents in that socket usually last about a year and cost a fraction of the led lamp.
I will move to new technology when they have something use able,  not when it hurts my eyes and won't quite fit the sockets and fittings I have around my house.
Currently I think Europe's grand ideas need to wait until technology has caught up with them before they enforce bad lighting on everyone.
I have a cupboard full of incandescent bulbs that I shall use until I can't get any more.
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