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| Science Forum Index » Engineering - Lighting Forum » Small Nichia white spectrum added... |
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| I.N. Galidakis... |
 Posted: Wed Oct 07, 2009 10:09 pm |
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Guest
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There was one small addition to my spectra page. One Nichia-type white LED,
which was found in a very strange place, performing a very strange function:
My Mother went out to the local bazaar on August 15, and was convinced by a
Pakistani seller to buy a small cheap lighter which had this LED at its back
end.
The optics arrangement on the bottom of the lighter was as follows:
1) Three small batteries connected in series, with
2) a small (5mm), transparent (apparently non-phosphor) Nichia(?) type LED
3) a tiny piece of film depicting an Asian porno scene,
4) a small projector lens in front of the LED.
When one pushes the tiny switch on the side of the lighter, the lighter projects
the porno scene on the wall.
After carefully dissecting the corresponding component, I examined the LED and
it seems to be a typical very cool Nichia-type white, with an approximate color
temp of 7,000-8,000 K.
It almost looks violet-blue. I am not exactly sure of the type, but I think that
it might be the white non-phosphored LED shown on this LED museum page:
http://ledmuseum.home.att.net/ledwht.htm
Its spectrum was added to my amici page as spectrum [1.7.4]:
http://ioannis.virtualcomposer2000.com/spectroscope/amici.html#colorphotos
The spectrum appears to have two very strong peaks, one near 450-455nm and
another near 560nm(?)
If anyone knows anything more on this item, like CRI, efficiency and chemical
operation details, please post so I can add the data to the page.
Thanks,
--
Ioannis |
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| Don Klipstein... |
| Posted: Thu Oct 08, 2009 3:35 am |
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Guest
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In article <1254975013.197883 at (no spam) athprx03>, I.N. Galidakis wrote:
[quote:172a88b17a]There was one small addition to my spectra page. One Nichia-type white LED,
which was found in a very strange place, performing a very strange function:
My Mother went out to the local bazaar on August 15, and was convinced by a
Pakistani seller to buy a small cheap lighter which had this LED at its back
end.
The optics arrangement on the bottom of the lighter was as follows:
1) Three small batteries connected in series, with
2) a small (5mm), transparent (apparently non-phosphor) Nichia(?) type LED
3) a tiny piece of film depicting an Asian porno scene,
4) a small projector lens in front of the LED.
When one pushes the tiny switch on the side of the lighter, the lighter projects
the porno scene on the wall.
After carefully dissecting the corresponding component, I examined the LED and
it seems to be a typical very cool Nichia-type white, with an approximate color
temp of 7,000-8,000 K.
It almost looks violet-blue. I am not exactly sure of the type, but I think that
it might be the white non-phosphored LED shown on this LED museum page:
http://ledmuseum.home.att.net/ledwht.htm
Its spectrum was added to my amici page as spectrum [1.7.4]:
http://ioannis.virtualcomposer2000.com/spectroscope/amici.html#colorphotos
The spectrum appears to have two very strong peaks, one near 450-455nm and
another near 560nm(?)
If anyone knows anything more on this item, like CRI, efficiency and chemical
operation details, please post so I can add the data to the page.
[/quote:172a88b17a]
My guess is that a white LED in a lighter is unlikely to be by Nichia,
but by a lower cost manufacturer such as one of the ones in China.
Meanwhile, despite the clear body, the LED is extremely likely
phosphored with a YAG phosphor, and using a blue-emitting LED die. Look
for yellow phosphor covering the LED die (chip). See if it fluoresces
yellowish if you point the LED (unpowered) at a deep blue light source.
CRI of most of these is around 70.
- Don Klipstein (don at (no spam) misty.com) |
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| I.N. Galidakis... |
| Posted: Thu Oct 08, 2009 10:30 am |
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Guest
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Don Klipstein wrote:
[quote:a713815957]In article <1254975013.197883 at (no spam) athprx03>, I.N. Galidakis wrote:
There was one small addition to my spectra page. One Nichia-type white LED,
which was found in a very strange place, performing a very strange function:
My Mother went out to the local bazaar on August 15, and was convinced by a
Pakistani seller to buy a small cheap lighter which had this LED at its back
end.
The optics arrangement on the bottom of the lighter was as follows:
1) Three small batteries connected in series, with
2) a small (5mm), transparent (apparently non-phosphor) Nichia(?) type LED
3) a tiny piece of film depicting an Asian porno scene,
4) a small projector lens in front of the LED.
When one pushes the tiny switch on the side of the lighter, the lighter
projects the porno scene on the wall.
After carefully dissecting the corresponding component, I examined the LED
and it seems to be a typical very cool Nichia-type white, with an
approximate color temp of 7,000-8,000 K.
It almost looks violet-blue. I am not exactly sure of the type, but I think
that it might be the white non-phosphored LED shown on this LED museum page:
http://ledmuseum.home.att.net/ledwht.htm
Its spectrum was added to my amici page as spectrum [1.7.4]:
http://ioannis.virtualcomposer2000.com/spectroscope/amici.html#colorphotos
The spectrum appears to have two very strong peaks, one near 450-455nm and
another near 560nm(?)
If anyone knows anything more on this item, like CRI, efficiency and chemical
operation details, please post so I can add the data to the page.
My guess is that a white LED in a lighter is unlikely to be by Nichia,
but by a lower cost manufacturer such as one of the ones in China.
Meanwhile, despite the clear body, the LED is extremely likely
phosphored with a YAG phosphor, and using a blue-emitting LED die. Look
for yellow phosphor covering the LED die (chip). See if it fluoresces
yellowish if you point the LED (unpowered) at a deep blue light source.
[/quote:a713815957]
Ah, you are right, Don. Looking at the LED from above, I see a yellow tint.
Many thanks. I will add the info to the page.
[quote:a713815957]CRI of most of these is around 70.
- Don Klipstein (don at (no spam) misty.com)
--[/quote:a713815957]
Ioannis |
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