Empathy List Archives

BC

Brooke Clarke

Fri, Jan 29, 2010 9:07 PM

Hi David:

Thanks for the link. I like them. The only problem is that you can not
order on line or by phone from Ikea and the nearest store is over two
hours drive away.

Have Fun,

Brooke Clarke
http://www.PRC68.com

David Martindale wrote:

There are multiple versions, including wall-mount and one that clamps onto
the edge of an object like a bookshelf. Here is the family:

http://www.ikea.com/us/en/search/?query=jansjo

They all probably have the same LED head. If you don't need a long
gooseneck, the wall and clamp versions are the cheapest way to get the head
plus a short gooseneck. They give a circle of light with a fairly sharp
cutoff at the edge of the circle. Think of it as something that will fit
into many of the places where you would really like to have a fiber optic
light source, but at 1/5 the cost.

The little wall wart is a regulated constant-current supply (not constant
voltage), which ought to make the light output relatively constant despite
LED temperature changes and wire resistance changes. However, I find that
the cheap inline switch has contacts that tend to get dirty or oxidize, and
the LED flickers until I flip the switch on and off a couple of times to
clean the contacts. If you're going to modify it anyway, install a better
switch.

I have two of these. One clamp-base is mounted on my computer desk, up
high, where it illuminates my keyboard without washing out the monitor. The
other has the weighted desk base, and it's useful as a reading lamp as well
as illuminating things under the stereomicroscope, and looking inside
cluttered equipment chassis.

    Dave

On Fri, Jan 29, 2010 at 8:59 AM, Brooke Clarkebrooke@pacific.net wrote:

Hi Poul:

Can the base be hung on a wall?
http://www.ikea.com/us/en/catalog/products/10128734

Have Fun,

Brooke Clarke
http://www.PRC68.com

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Hi David: Thanks for the link. I like them. The only problem is that you can not order on line or by phone from Ikea and the nearest store is over two hours drive away. Have Fun, Brooke Clarke http://www.PRC68.com David Martindale wrote: > There are multiple versions, including wall-mount and one that clamps onto > the edge of an object like a bookshelf. Here is the family: > > http://www.ikea.com/us/en/search/?query=jansjo > > They all probably have the same LED head. If you don't need a long > gooseneck, the wall and clamp versions are the cheapest way to get the head > plus a short gooseneck. They give a circle of light with a fairly sharp > cutoff at the edge of the circle. Think of it as something that will fit > into many of the places where you would really like to have a fiber optic > light source, but at 1/5 the cost. > > The little wall wart is a regulated constant-current supply (not constant > voltage), which ought to make the light output relatively constant despite > LED temperature changes and wire resistance changes. However, I find that > the cheap inline switch has contacts that tend to get dirty or oxidize, and > the LED flickers until I flip the switch on and off a couple of times to > clean the contacts. If you're going to modify it anyway, install a better > switch. > > I have two of these. One clamp-base is mounted on my computer desk, up > high, where it illuminates my keyboard without washing out the monitor. The > other has the weighted desk base, and it's useful as a reading lamp as well > as illuminating things under the stereomicroscope, and looking inside > cluttered equipment chassis. > > Dave > > On Fri, Jan 29, 2010 at 8:59 AM, Brooke Clarke<brooke@pacific.net> wrote: > > >> Hi Poul: >> >> Can the base be hung on a wall? >> http://www.ikea.com/us/en/catalog/products/10128734 >> >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> >> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > >

MD

Magnus Danielson

Fri, Jan 29, 2010 9:34 PM

Poul-Henning Kamp wrote:

In message 6755CB2A-9566-4F35-818E-38471BE6528F@cq.nu, Bob Camp writes:

And now "they" are trying to do away with edison bulbs. I hope
the LED equivalents are better, because the CF bulbs seem to last
less in most home apps.

Speaking of LED lamps: I want to point out that at least over here
IKEA has a wonderful little LED lamp for the worktable.

It's a single 3W white led, at the end of a 55cm long (that's 20" for
the imperialists amongst us) "swan-neck".

LED lamps... the one thing I keep being annoyed about is the aspect of
having three peaks of relative narrow spectrums rather than the normal
continuous spectrum mainly being that of the temperature signature.

Anyone out there looking at the frequency spectrum of these low-energy
lamps?

Colour response from few-spike lamps is not really the same than from
continuous spectrums.

I use one for my small CNC-mill:

http://ing.dk/uploads/society/content/232.png

It's called "JAN SJÖ" here, not sure if they use that name in other
geographies.

IKEA has a habit of giving all their products Swedish names for their
products... worldwide. It's part of their trademark so to speak.

Cheers,
Magnus

Poul-Henning Kamp wrote: > In message <6755CB2A-9566-4F35-818E-38471BE6528F@cq.nu>, Bob Camp writes: > >>> And now "they" are trying to do away with edison bulbs. I hope >>> the LED equivalents are better, because the CF bulbs seem to last >>> less in most home apps. > > Speaking of LED lamps: I want to point out that at least over here > IKEA has a wonderful little LED lamp for the worktable. > > It's a single 3W white led, at the end of a 55cm long (that's 20" for > the imperialists amongst us) "swan-neck". LED lamps... the one thing I keep being annoyed about is the aspect of having three peaks of relative narrow spectrums rather than the normal continuous spectrum mainly being that of the temperature signature. Anyone out there looking at the frequency spectrum of these low-energy lamps? Colour response from few-spike lamps is not really the same than from continuous spectrums. > I use one for my small CNC-mill: > > http://ing.dk/uploads/society/content/232.png > > It's called "JAN SJÖ" here, not sure if they use that name in other > geographies. IKEA has a habit of giving all their products Swedish names for their products... worldwide. It's part of their trademark so to speak. Cheers, Magnus

JF

J. Forster

Fri, Jan 29, 2010 11:59 PM

Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer
does not go further than the limits shown.

Best,
-John

===============

LED lamps... the one thing I keep being annoyed about is the aspect of
having three peaks of relative narrow spectrums rather than the normal
continuous spectrum mainly being that of the temperature signature.

Anyone out there looking at the frequency spectrum of these low-energy
lamps?

Colour response from few-spike lamps is not really the same than from
continuous spectrums.

Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer does not go further than the limits shown. Best, -John =============== > LED lamps... the one thing I keep being annoyed about is the aspect of > having three peaks of relative narrow spectrums rather than the normal > continuous spectrum mainly being that of the temperature signature. > > Anyone out there looking at the frequency spectrum of these low-energy > lamps? > > Colour response from few-spike lamps is not really the same than from > continuous spectrums.

BC

Brooke Clarke

Sat, Jan 30, 2010 12:20 AM

Hi John:

Would you mention the make and model number of the SA and LED?

Have Fun,

Brooke Clarke
http://www.PRC68.com

J. Forster wrote:

Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer
does not go further than the limits shown.

Best,
-John

===============

LED lamps... the one thing I keep being annoyed about is the aspect of
having three peaks of relative narrow spectrums rather than the normal
continuous spectrum mainly being that of the temperature signature.

Anyone out there looking at the frequency spectrum of these low-energy
lamps?

Colour response from few-spike lamps is not really the same than from
continuous spectrums.

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Hi John: Would you mention the make and model number of the SA and LED? Have Fun, Brooke Clarke http://www.PRC68.com J. Forster wrote: > Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer > does not go further than the limits shown. > > Best, > -John > > =============== > > > >> LED lamps... the one thing I keep being annoyed about is the aspect of >> having three peaks of relative narrow spectrums rather than the normal >> continuous spectrum mainly being that of the temperature signature. >> >> Anyone out there looking at the frequency spectrum of these low-energy >> lamps? >> >> Colour response from few-spike lamps is not really the same than from >> continuous spectrums. >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there.

MD

Magnus Danielson

Sat, Jan 30, 2010 1:12 AM

J. Forster wrote:

Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer
does not go further than the limits shown.

Looks pretty continuous to me. Great. I know there is non-continuous
LEDs out there, but I hope they will fade to grey while continuous takes
the market.

Cheers,
Magnus

J. Forster wrote: > Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer > does not go further than the limits shown. Looks pretty continuous to me. Great. I know there is non-continuous LEDs out there, but I hope they will fade to grey while continuous takes the market. Cheers, Magnus

JF

J. Forster

Sat, Jan 30, 2010 1:15 AM

To my aging eyes, the flashlight looks distinctly blue-white. I don't know
how these particular LEDs are built, but the unit is less than a year old.

-John

===============

J. Forster wrote:

Attached is a spectrum of a "white" LED Flashlight. My diode
spectrometer
does not go further than the limits shown.

Looks pretty continuous to me. Great. I know there is non-continuous
LEDs out there, but I hope they will fade to grey while continuous takes
the market.

Cheers,
Magnus

To my aging eyes, the flashlight looks distinctly blue-white. I don't know how these particular LEDs are built, but the unit is less than a year old. -John =============== > J. Forster wrote: >> Attached is a spectrum of a "white" LED Flashlight. My diode >> spectrometer >> does not go further than the limits shown. > > Looks pretty continuous to me. Great. I know there is non-continuous > LEDs out there, but I hope they will fade to grey while continuous takes > the market. > > Cheers, > Magnus > >

DI

David I. Emery

Sat, Jan 30, 2010 3:58 AM

On Fri, Jan 29, 2010 at 05:15:51PM -0800, J. Forster wrote:

To my aging eyes, the flashlight looks distinctly blue-white. I don't know
how these particular LEDs are built, but the unit is less than a year old.

My understanding is that a lot of high brightness "white" LEDs

are internally a UV emitting LED junction illuminating a phosphor. The
light you see comes mostly from the phosphor.

Lighting type phosphors have been around forever in fluorescent

bulbs... and are fairly continuous spectra mostly...

I don't think there is any way of getting broadband white light

out of a LED junction, though of course hybrids of multiple different
color LEDs can be used (and are in the display business).

--
Dave Emery N1PRE/AE, die@dieconsulting.com DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in
celebration of what could have been, but wasn't and is not to be now either."

On Fri, Jan 29, 2010 at 05:15:51PM -0800, J. Forster wrote: > To my aging eyes, the flashlight looks distinctly blue-white. I don't know > how these particular LEDs are built, but the unit is less than a year old. My understanding is that a lot of high brightness "white" LEDs are internally a UV emitting LED junction illuminating a phosphor. The light you see comes mostly from the phosphor. Lighting type phosphors have been around forever in fluorescent bulbs... and are fairly continuous spectra mostly... I don't think there is any way of getting broadband white light out of a LED junction, though of course hybrids of multiple different color LEDs can be used (and are in the display business). -- Dave Emery N1PRE/AE, die@dieconsulting.com DIE Consulting, Weston, Mass 02493 "An empty zombie mind with a forlorn barely readable weatherbeaten 'For Rent' sign still vainly flapping outside on the weed encrusted pole - in celebration of what could have been, but wasn't and is not to be now either."

CH

Chuck Harris

Sat, Jan 30, 2010 7:13 AM

The LED lamps that I have seen use UV LED's with a fluorescent material
in the LED to make it appear white. I don't know what the spectrum looks
like, but to my eye it appears to be pretty white.

-Chuck Harris

Magnus Danielson wrote:

Poul-Henning Kamp wrote:

In message 6755CB2A-9566-4F35-818E-38471BE6528F@cq.nu, Bob Camp writes:

And now "they" are trying to do away with edison bulbs. I hope
the LED equivalents are better, because the CF bulbs seem to last
less in most home apps.

Speaking of LED lamps: I want to point out that at least over here
IKEA has a wonderful little LED lamp for the worktable.

It's a single 3W white led, at the end of a 55cm long (that's 20" for
the imperialists amongst us) "swan-neck".

LED lamps... the one thing I keep being annoyed about is the aspect of
having three peaks of relative narrow spectrums rather than the normal
continuous spectrum mainly being that of the temperature signature.

Anyone out there looking at the frequency spectrum of these low-energy
lamps?

Colour response from few-spike lamps is not really the same than from
continuous spectrums.

I use one for my small CNC-mill:

 http://ing.dk/uploads/society/content/232.png

It's called "JAN SJÖ" here, not sure if they use that name in other
geographies.

IKEA has a habit of giving all their products Swedish names for their
products... worldwide. It's part of their trademark so to speak.

Cheers,
Magnus

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

The LED lamps that I have seen use UV LED's with a fluorescent material in the LED to make it appear white. I don't know what the spectrum looks like, but to my eye it appears to be pretty white. -Chuck Harris Magnus Danielson wrote: > Poul-Henning Kamp wrote: >> In message <6755CB2A-9566-4F35-818E-38471BE6528F@cq.nu>, Bob Camp writes: >> >>>> And now "they" are trying to do away with edison bulbs. I hope >>>> the LED equivalents are better, because the CF bulbs seem to last >>>> less in most home apps. >> >> Speaking of LED lamps: I want to point out that at least over here >> IKEA has a wonderful little LED lamp for the worktable. >> >> It's a single 3W white led, at the end of a 55cm long (that's 20" for >> the imperialists amongst us) "swan-neck". > > LED lamps... the one thing I keep being annoyed about is the aspect of > having three peaks of relative narrow spectrums rather than the normal > continuous spectrum mainly being that of the temperature signature. > > Anyone out there looking at the frequency spectrum of these low-energy > lamps? > > Colour response from few-spike lamps is not really the same than from > continuous spectrums. > >> I use one for my small CNC-mill: >> >> http://ing.dk/uploads/society/content/232.png >> >> It's called "JAN SJÖ" here, not sure if they use that name in other >> geographies. > > IKEA has a habit of giving all their products Swedish names for their > products... worldwide. It's part of their trademark so to speak. > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

DL

Don Latham

Sat, Jan 30, 2010 7:26 AM

also matches the sun within reason...
Don
----- Original Message -----
From: "Magnus Danielson" magnus@rubidium.dyndns.org
To: jfor@quik.com; "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Friday, January 29, 2010 6:12 PM
Subject: Re: [time-nuts] Conducting Bench Top Material

J. Forster wrote:

Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer
does not go further than the limits shown.

Looks pretty continuous to me. Great. I know there is non-continuous LEDs
out there, but I hope they will fade to grey while continuous takes the
market.

Cheers,
Magnus

time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

also matches the sun within reason... Don ----- Original Message ----- From: "Magnus Danielson" <magnus@rubidium.dyndns.org> To: <jfor@quik.com>; "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Friday, January 29, 2010 6:12 PM Subject: Re: [time-nuts] Conducting Bench Top Material > J. Forster wrote: >> Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer >> does not go further than the limits shown. > > Looks pretty continuous to me. Great. I know there is non-continuous LEDs > out there, but I hope they will fade to grey while continuous takes the > market. > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

DS

d.seiter@comcast.net

Sat, Jan 30, 2010 7:32 AM

I took apart the last dead one just for that purpose. I initially eyed the 105deg Al cap, but it was dead, along with one of the xstrs (hole in package). The film caps, diodes and fuse are still good too. As is the tube- don't know what I'll do with that.

-Dave
----- Original Message -----
From: "Max Robinson" max@maxsmusicplace.com
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Friday, January 29, 2010 12:39:25 PM GMT -07:00 US/Canada Mountain
Subject: Re: [time-nuts] Conducting Bench Top Material

I've heard you can salvage some good rectifiers and maybe a transistor or
two from dead CF bulbs.

Regards.

Max. K 4 O D S.

Email: max@maxsmusicplace.com

Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
Music site: http://www.maxsmusicplace.com

To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe@yahoogroups.com

To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe@yahoogroups.com

----- Original Message -----
From: d.seiter@comcast.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Friday, January 29, 2010 1:32 AM
Subject: Re: [time-nuts] Conducting Bench Top Material

And now "they" are trying to do away with edison bulbs. I hope the LED
equivalents are better, because the CF bulbs seem to last less in most
home apps. (I have "standard" bulbs that have outlasted multiple CF bulbs
in similar applications) In particular, I have a 75W desk lamp bulb which
has been in use since '97 and gets more hours than the ceiling CFs in the
same room, which have been replaced at least 3 times...

They are not enclosed or abused. I was really PO'd at the short life of my
first set of CF lamps. They seem to be doing better now, but still there
is no great enhanced life span.

Dave
----- Original Message -----
From: "Bill Hawkins" bill@iaxs.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Thursday, January 28, 2010 2:28:31 AM GMT -07:00 US/Canada Mountain
Subject: Re: [time-nuts] Conducting Bench Top Material

Warning: Way OT

When the vacuum tube was born, there were half as many people on
this planet, and global climate change wasn't a problem. Very few
people will talk about populution. It's as if there was a blind
spot in the brain. Maybe there's no intelligent life in the
Universe because all life evolves with similar selection pressures.
Once technology removes natural predators (or stops world wars with
the atomic bomb), population heads for the sky until the big die-off.

If other people don't have a problem with having four kids, I have
no problem with using vacuum tubes and Edison bulbs.

All in my humble opinion, of course.

Bill Hawkins

-----Original Message-----
From: Rex
Sent: Wednesday, January 27, 2010 11:50 PM

Steve Rooke wrote:

Wasn't life so much easier with valves (tubes)...

Nostalgia?

Valves (tubes) warmer in close proximity, yes. Global warming should
make that, on average, less helpful.
........
glowing bulbs
Other than that memory, and certain trade-offs at big Rf power, I'll say
I no longer encourage the glowing bulbs for most things.

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No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.432 / Virus Database: 271.1.1/2654 - Release Date: 01/28/10
19:36:00

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I took apart the last dead one just for that purpose. I initially eyed the 105deg Al cap, but it was dead, along with one of the xstrs (hole in package). The film caps, diodes and fuse are still good too. As is the tube- don't know what I'll do with that. -Dave ----- Original Message ----- From: "Max Robinson" <max@maxsmusicplace.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Friday, January 29, 2010 12:39:25 PM GMT -07:00 US/Canada Mountain Subject: Re: [time-nuts] Conducting Bench Top Material I've heard you can salvage some good rectifiers and maybe a transistor or two from dead CF bulbs. Regards. Max. K 4 O D S. Email: max@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscribe@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscribe@yahoogroups.com ----- Original Message ----- From: <d.seiter@comcast.net> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Friday, January 29, 2010 1:32 AM Subject: Re: [time-nuts] Conducting Bench Top Material > And now "they" are trying to do away with edison bulbs. I hope the LED > equivalents are better, because the CF bulbs seem to last less in most > home apps. (I have "standard" bulbs that have outlasted multiple CF bulbs > in similar applications) In particular, I have a 75W desk lamp bulb which > has been in use since '97 and gets more hours than the ceiling CFs in the > same room, which have been replaced at least 3 times... > > They are not enclosed or abused. I was really PO'd at the short life of my > first set of CF lamps. They seem to be doing better now, but still there > is no great enhanced life span. > > Dave > ----- Original Message ----- > From: "Bill Hawkins" <bill@iaxs.net> > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Sent: Thursday, January 28, 2010 2:28:31 AM GMT -07:00 US/Canada Mountain > Subject: Re: [time-nuts] Conducting Bench Top Material > > Warning: Way OT > > When the vacuum tube was born, there were half as many people on > this planet, and global climate change wasn't a problem. Very few > people will talk about populution. It's as if there was a blind > spot in the brain. Maybe there's no intelligent life in the > Universe because all life evolves with similar selection pressures. > Once technology removes natural predators (or stops world wars with > the atomic bomb), population heads for the sky until the big die-off. > > If other people don't have a problem with having four kids, I have > no problem with using vacuum tubes and Edison bulbs. > > All in my humble opinion, of course. > > Bill Hawkins > > -----Original Message----- > From: Rex > Sent: Wednesday, January 27, 2010 11:50 PM > > Steve Rooke wrote: >> Wasn't life so much easier with valves (tubes)... > Nostalgia? > > Valves (tubes) warmer in close proximity, yes. Global warming should > make that, on average, less helpful. > ........ > glowing bulbs > Other than that memory, and certain trade-offs at big Rf power, I'll say > I no longer encourage the glowing bulbs for most things. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.432 / Virus Database: 271.1.1/2654 - Release Date: 01/28/10 19:36:00 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

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Conducting Bench Top Material