Led Lighting

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Re: Led Lighting

Postby inthaiguy » Sun Oct 05, 2014 1:14 pm

Stay away from Home Pro for this. I just got a couple 30w and 50w LED floodlights off Lazada at about half the price of Home Pro. Same stuff. http://www.lazada.co.th/catalog/?q=led+50w
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Re: Led Lighting

Postby Andyfteeze » Tue Oct 07, 2014 5:09 pm

I recently built an apartment upstairs in a factory and put led lights in. Normal halogen 50w globe puts out about 750lumens.
Led lights with this much output were new to the australian market last december. they were a little bigger than your standard fitting. i am still about 6-10 months off from starting so havent done any research on whats available here. but i know how much light is required. I would definetly NOT buy anything in LED less than 700lumens output or your ceiling will look like swiss cheese, lol
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Re: Led Lighting

Postby fredlk » Tue Oct 07, 2014 7:41 pm

From http://www.bbc.co.uk/news/science-environment-29518521:

"Invention of blue LEDs receives physics Nobel

The 2014 Nobel Prize for physics has been awarded to a trio of scientists in Japan and the US for the invention of blue light emitting diodes (LEDs).

Professors Isamu Akasaki, Hiroshi Amano and Shuji Nakamura made the first blue LEDs in the early 1990s.

By combining blue light with existing red and green LEDs, this enabled a new generation of bright, energy-efficient white lamps.

The winners will share prize money of eight million kronor (£0.7m).

They were named at a press conference in Sweden, and join a prestigious list of 196 other Physics laureates recognised since 1901.

Staffan Normark, Royal Swedish Academy of Sciences, announces the physics prize

Prof Nakamura, who was woken up in Japan to receive the news, told the press conference, "It's unbelievable."

Making the announcement, the Nobel jury emphasised the usefulness of the invention, adding that the Nobel Prizes were established to recognise developments that delivered "the greatest benefit to mankind".

"These uses are what would make Alfred Nobel very happy," said Prof Olle Inganas, a member of the prize committee from Linkoping University.

The committee chair, Prof Per Delsing, from Chalmers University of Technology in Gothenburg, emphasised the winners' dedication.

"What's fascinating is that a lot of big companies really tried to do this and they failed," he said. "But these guys persisted and they tried and tried again - and eventually they actually succeeded."

Although red and green LEDs had been around for many years, blue LEDs were a long-standing challenge for scientists in both academia and industry. Without them, the three colours could not be mixed to produce white light in lamps, as well as in computer and TV screens.

Today, blue LEDs are found in people's pockets around the world, inside the lights and screens of smartphones.

White LED lamps, meanwhile, deliver white light to offices and households around the world. They use much less energy than both incandescent and fluorescent lamps.

That improvement arises because LEDs convert electricity directly into photons of light, instead of the wasteful mixture of heat and light generated inside traditional incandescent bulbs. Those bulbs use current to heat a wire filament until it glows, while the gas discharge inside fluorescent lamps also produces both heat and light.

Inside an LED, current is applied to a sandwich of semiconductor materials, which emit a particular wavelength of light depending on the chemical make-up of those materials.

Gallium nitride was the key ingredient used by the Nobel laureates in their ground-breaking blue LEDs. Growing big enough crystals of this compound was the stumbling block that stopped many other researchers - but Profs Akasaki and Amano, working at Nagoya University in Japan, managed to grow them in 1986 on a specially-designed scaffold made partly from sapphire.

Four years later, Prof Nakamura made a similar breakthrough, while he was working at the Nichia Chemicals. Instead of a special substrate, he used a clever manipulation of temperature to boost the growth of the all-important crystals.

In its award citation, the Nobel committee declared: "Incandescent light bulbs lit the 20th Century; the 21st Century will be lit by LED lamps."

Commenting on the news, the president of the Institute of Physics, Dr Frances Saunders, emphasised that energy-efficient lamps form an important part of the effort to help slow carbon dioxide emissions worldwide.

"With 20% of the world's electricity used for lighting, it's been calculated that optimal use of LED lighting could reduce this to 4%," he said.

"Akasaki, Amano and Nakamura's research has made this possible. This is physics research that is having a direct impact on the grandest of scales, helping protect our environment, as well as turning up in our everyday electronic gadgets."

LED lamps have the potential to help more than 1.5 billion people around the world who do not have access to electricity grids - because they are efficient enough to run on cheap, local solar power.

Professor Sir Colin Humphreys from the University of Cambridge commented: "This is a tremendous achievement and Akasaki, Amano and Nakamura are very worthy winners. Their invention of efficient blue LEDs has paved the way for the development of bright, cost effective and, importantly, energy efficient white lighting."
"
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Re: Led Lighting

Postby fredlk » Sat Jan 10, 2015 8:38 am

For those who were waiting for this, after 3 and a half years of continuous nighttime use I have had half a failure in one of my 80-odd led lamps:
IMG_4856.jpg
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Re: Led Lighting

Postby MGV12 » Sat Jan 10, 2015 9:40 am

fredlk wrote:For those who were waiting for this, after 3 and a half years of continuous nighttime use I have had half a failure in one of my 80-odd led lamps:
IMG_4856.jpg


Don't fret Fred ... I had one go like that and after a few days it came back on 100% again. That was six months ago. :D

Just like our LED Smart TV. We didn't use it for a while and then when we did switch it on there were shimmering lines across the top two inches of the screen. Out of warranty and allegedly needed a new '"panel" at 19,000 Baht! We declined and a few days later the fault simply disappeared ... and has never reappeared.

Maybe LED's are self-healing :lol: :lol: :lol:

“Some days I am an optimistic pessimist ... other days I am a pessimistic optimist”
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Re: Led Lighting

Postby schuimpge » Mon Jan 12, 2015 9:53 pm

Half a year into full LED house totaling 250 watt with 36 or so light points. Had 1 failure and the rest is just doing great.
With a very old aircon, solar water heater, solar water pumps and lots of tools, the monthly punishment is just 800-900 baht from PEA :mrgreen:
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