[time-nuts] [OT] Ikea Lamp

[K3WRY at aol.com]

lamps  ?  boy you all ran out of something to talk about
 
Joe
 
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In a message dated 1/29/2010 3:22:59 P.M. Eastern Standard Time,  
dave.martindale at gmail.com writes:

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 at 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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