http://confocal-microscopy-list.275.s1.nabble.com/LEDs-tp4283200p7323977.html
And with regard to Lumencor and similar light engines, a description of the system can be found here:
and more detailed information of what's inside can be found in Lumencor's various patents, such as this one:
Yeah, the part where it sort-of has a bulb threw me for a loop. So it
dielectric. It will be interesting to learn what the 'field' lifetime of
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>
> If you follow the links from that Thorlab website you gave, you find:
>
> "the heart of LIFI(r) is the bulb sub-assembly where a sealed bulb is
> embedded in a dielectric material. This design is more reliable than
> conventional light sources that insert degradable electrodes into the bulb.
> The dielectric material serves two purposes: first as a waveguide for the
> RF energy transmitted by the RF Power Amplifier Circuit (PA) and second as
> an electric field concentrator that focuses energy in the bulb. The energy
> from the electric field rapidly heats the material in the bulb to a plasma
> state that emits light of high intensity and full spectrum."
>
> In other words, it's not solid-state at all. But it's a very neat idea.
> Note that they don't tell you what's in the bulb!
>
>
> Guy
>
> -----Original Message-----
> From: Confocal Microscopy List [mailto:
[hidden email]]
> On Behalf Of Craig Brideau
> Sent: Monday, 27 February 2012 12:11 PM
> To:
[hidden email]
> Subject: Re: LEDs
>
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>
> Some of these 'solid state' light sources claim to be plasma based? What
> are these things, and does anyone care to share their experiences with
> them? Here's a link to the kind of source I'm talking about:
>
>
http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=5551>
> I don't have any experience with these and was curious.
>
> Craig
>
>
> On Sun, Feb 26, 2012 at 10:38 AM, Christian Mohn <
>
[hidden email]
> > wrote:
>
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> >
> > Hi,
> >
> > we are just about to go thru the same procedure. Some things became
> > obvious while unravelling the marketing pdfs.
> > 1. nobody tells you where and how they measure output or what the
> > illuminated field of view is... 45mW on a 11mm f.o.v is different from
> > 45 mW on a 25mm field of view (I assume the direct coupled will all
> > fill the 25 while a 0.3NA fibre only fills F.oV of 16mm reasonably) 2.
> > solid-state is just another word for "yes, for some we use a phosphor
> > in front the led chip" and this will definatly not increase overall
> > power since phosphorescence will never reach 100% efficiency....
> >
> > My advice... get a device to your lab and test it.
> >
> > Best wishes from the cold north,
> >
> > Chris
> >
>