> Search the CONFOCAL archive at
>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>
>
Hi Alison and all,
>
> CoolLed has a 3 channel version available
in the states for $8,500 list.
>
>
Best,
>
>
>
> Gary Laevsky,
Ph.D.
>
> Imaging Application
Specialist
>
>
>
> Andor
Technology
>
> discover new ways of
seeing
>
>
>
>
[hidden email]>
>
Cell (774) 291 -
9992
> Office (860) 290 - 9211
x219
> Fax (860)
290 - 9566
> Web:
www.andor.com>
> -----Original
Message-----
> From: Confocal Microscopy List [
[hidden email]]
On
> Behalf Of Alison North
> Sent: Wednesday, May 07, 2008
10:51 AM
> To:
[hidden email]> Subject: Re:
HBO/Mercury lamp lifetimes
>
> Search the CONFOCAL archive
at
>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>
>
Hi Jim,
>
> Oh you cruel man, you are mercilessly TAUNTING those
of us based in the
> USA who would love to buy your LEDs but are
prevented from doing so by
> exceptionally irritating patent
restrictions (hello to the company
> concerned - your LED system is
prohibitively expensive!). Or am I
> missing something and this
situation has recently changed? Do keep us
> posted
please? And yes, I am intentionally sending this to the
>
listserver, so that other people based in this country don't get all
>
excited by your LEDs and have their hopes dashed, like us. Plus, if
I
> am incorrect about the patent situation and we can in fact obtain
an
> LED-based lamp here at a reasonable price (without having to
assemble
> everything ourselves), we would like to
know.
>
> Thanks and best wishes,
>
Alison
>
>
> James Beacher wrote:
>> Search the
CONFOCAL archive at
>>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>>
Commercial Interest
>>
>>
>> Having
followed this discussion, we can contain ourselves no
>>
longer.........*LEDs!*
>>
>>
>>
>>
JIM Beacher
>> CoolLED
Ltd
>>
>>
>>
>>
-----Original Message-----
>> *From:*
"Confocal Microscopy List"
<
[hidden email]>
>>
*Sent:* 07/05/2008 14:50
>> *To:*
"
[hidden email]"
>
<
[hidden email]>
>>
*Subject:* Re: HBO/Mercury lamp
lifetimes
>>
>>
>> Search
the CONFOCAL archive at
>>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>>
>>
Hi all,
>>
>> I would like to go
back to an earlier post, and reiterate that
>
there
>> are several different types of
power supplies. The
>
constant-current
>> ones increase the
applied voltage as the "conductivity" of the
>
bulb
>> decreases. This means that the
amount of power deposited in the
>
arc
>> slowly INCREASES as the electrodes
age and eventually, this will
>> cause
overheating, and softening of the fused-quartz
envelope.
>> Constant-power supplies will
not cause this problem, but the
>>
intensity of the brightest part of the arc will slowly
deteriorate
>> with
time.
>>
>> Another factor is
dirt. Either finger grease or perhaps
some
>> accidental event such as a small,
fried insect or a very small
>
piece
>> of flaked-off black paint. In
short, anything that absorbs light
>
and
>> gets hot while attached in some way
to the quartz envelope. Any
>
"dark
>> spot" will cause local overheating
and asymmetrical envelope
>
failure.
>> A second possibility has to to
with the connections between the
>
bulb
>> and the housing. If the mating
surfaces of these metal parts
>
become
>> corroded, or oxidized, the
contact resistance will increase as
>
will
>> the working temperature. This also
can lead to premature envelope
>>
failure.
>>
>> Even the alignment
of the spherical rear mirror can be important.
>
If
>> the reflected image of the arc is
formed not to the side of the
>
arc
>> itself but concentrated onto a small
section of the envelope, this
>> can
exacerbate any asymmetrical heating cause by dirt
or
>>
contamination.
>>
>> The effect of
these "operator" factors will vary somewhat
>
depending
>> on the type of power supply
used.
>>
>> Therefore, it seems to
me that the list of important variables
>
should
>> include not just be the bulb
manufacturer, the bulb type and
the
>> design of the power supply but the
care with which the new bulb
> has
>>
been installed and aligned.
>>
>>
And then there is the whole matter of variable-power Hg systems.
>
We
>> usually use our Atto-arc 50W at about
20% power and the bulbs
> often
>>
seem to last for over a thousand hours. More than enough
>
brightness
>> to find the part of
your sample best suited to confocal
analysis.
>>
>> Finally, there is
the matter of xenon arcs. These have all the
>
same
>> problems mentioned above, but in
addition, because they are
>
reputed
>> to start off having a much
higher gas pressure, any resulting
>>
explosions are said to be much more impressive, in fact
even
>> dangerous (albeit, without the
additional nuisance of Hg
>>
contamination). Has anyone had any experience
here?
>>
>>
Cheers,
>>
>> Jim
Pawley
>>
>>
>>
>Search the CONFOCAL archive at
>>
>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>>
>
>> >Hello
everyone
>>
>
>> >I think we are barking
under the wrong tree. Please correct me
> if
i
>> >am wrong, but many
explosions I read reported in this thread
>
(and
>> >only one -in 25 years-
which happened to me @50hrs) happened at
>
way
>> >less than the rated
hours.
>>
>
>> >Shouldn't we revise
the myth that changing the lamp early
>
protects
>> >from
explosions?
>>
>
>> >It seems to me that it is
either due to material failure (in
>
which
>> >case I think the lamp
manufacturers should pay the damage bill)
>
or
>> >too many ignitions, in
which case the manufacturers should
>
include
>> >this count in the
specs.
>>
>
>>
>Regards,
>>
>
>>
>*********************************
>>
>Stamatis Pagakis Ph.D.
>>
>Biological Imaging Unit
>>
>Biomedical Research Foundation, Academy of Athens,
Greece
>>
>
>> >>On 4 May 2008, at
00:54, Russell Spear wrote:
>>
>>Search the CONFOCAL archive
at
>> >>
http://listserv.acsu.buffalo.edu/cgi-bin/wa?S1=confocal>>
>>
>> >>So it isn't worth
the risk to use them past rated
hours.
>>
>>
>>
>>Russ
>>
>>
>>
>>
>>
>>
>> >>Russell N.
Spear
>> >>Sr. Research
Specialist
>> >>Dept. of Plant
Pathology
>> >>Univ. of
Wisconsin
>> >>1630 Linden
Dr.
>> >>Madison WI
53706
>>
>>
>> >>voice
608.263.2093
>>
>>fax
608.263.2626
>>
>>
>>
--
>>
**********************************************
>>
Prof. James B.
Pawley,
Ph.
>>
608-263-3147
>> Room 223, Zoology Research
Building,
>>
FAX 608-265-5315
>> 1117 Johnson
Ave., Madison, WI, 53706
>>
[hidden email]>> 3D Microscopy of
Living Cells Course, June 14-26, 2008,
UBC,
>> Vancouver
Canada
>> Info:
http://www.3dcourse.ubc.ca/
Applications due by
>> March 15,
2008
>>
"If it ain't diffraction, it must be statistics."
>
Anon.
>
Locked
