Re: LED Illumination

David,

Many thanks for your very appropriate references. I will study them with
care,
as I am sure, other readers of this group will.

G.R.

<cladocera56@xxxxxxxxxxxx> wrote in message
news:1151227017.226477.287230@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

NoSpam wrote:
"JOEL MANDELKORN" <mandelkorn@xxxxxxxxxxx> wrote in message
news:0fWmg.1509$il.960@xxxxxxxxxxx
I have looked on the net for a couple of hours and all I found were
led
lights with many leds in a ring. There is one article at
http://www.micrographia.com/articlz/artmicgr/lmpideal/lmpi0500.htm

The author hopes someone will make a good single led system for Kohler
illumination with an LED. Anyone know of a commercial product or is
it a
roll your own project.

Joel



You are referring to some LED lights with many LEDs in a ring. Are these
the
LEDs which are commonly referred to as "star LEDs" and which are now
sold
in large numbers as the source of light for all kinds of flash lights?

Does anybody know how these star LEDs are constructed? Do they emply one
light emitting diode or many?

Could these new light sources not be useful for Nelsonian illumination,
where
the light source is depicted into the sample and a diffuser is used?

Thank you
G.R.

Hi

In case of interest some enthusiasts have shared LED lighting projects
for some older scopes recently in 'Micscape' (microscopy hobbyists'
e-zine), including using the 'Star LED' (http://www.luxeonstar.com/).

eg see these articles:

Taking microscopes from the stone age with high wattage LEDs (Wild M40
retrofitted)
http://www.microscopy-uk.org.uk/mag/artfeb06/rp-wild-leds.html

Star LEDs for two LOMO microscopes (MikMed and stereo)
http://www.microscopy-uk.org.uk/mag/artmar06/rp-mikmed.html

Using high power LEDS in epi-illuminator systems (Olympus BHM as
example)
http://www.microscopy-uk.org.uk/mag/artjun06/rp-ledepi.html

An inexpensive LED cold light (ingenious battery powered portable cold
light source by uprating the LED in the USB LED lamps on goose necks
sold for laptops).
http://www.microscopy-uk.org.uk/mag/artjun06/ae-coldlight.html

regards

David



.

Relevant Pages

  • Re: LED Apparent Brightness
    ... >>>illumination when multiplexing is not needed... ... >>>equally short shutter time on the camera. ... >>>the IR illuminator could be the predominate light source, ... The other way, with three LEDs per pixel, you've got to send ...
    (sci.electronics.design)
  • Re: BGS in California - Why are so many of them so butt ugly?
    ... Fiber optic illuminators will drive ~50' of fiber optic cable wether ... The IESNA recommends that LEDs in 'fixtures' be down rated to 50,000 ... Neon wins on initial cost. ... a reference as a light source. ...
    (misc.transport.road)
  • Re: Excuses to watch B5 again
    ... it just uses LED's as the light source ... There are two kinds of LCD TVs - flat panels and rear projection. ... Flat panels use flourescent bulbs, ... blubs to LEDs. ...
    (rec.arts.sf.tv.babylon5.moderated)
  • Re: LED Illumination
    ... You are referring to some LED lights with many LEDs in a ring. ... Does anybody know how these star LEDs are constructed? ... the light source is depicted into the sample and a diffuser is used? ... Taking microscopes from the stone age with high wattage LEDs (Wild M40 ...
    (sci.techniques.microscopy)
  • Re: Minolta 5400 or Coolscan V
    ... If the conventional light source doesn't intrinsically make any ... difference to Kodachromes that makes the LED choice the perfect one! ... about LEDs somehow causing the narrow DOF of Nikon scanners. ... >characteristic curves typically are between KC and E6 films, ...
    (comp.periphs.scanners)
Quantcast