TECHNET Archives

May 2011

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Tue, 10 May 2011 06:12:14 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (116 lines)
Agree, microscope illumination and color correction are both need to consider.
LED module itself can be long life, I wouldn't put 50K on it. Let's just say, significantly longer compare to you light bulb.  The limiting factor is the control circuit design and heat sink design (need good current limiting and pulse modulation, plus slug somewhere to sink the heat.  LED efficiency light output is in low teens if not single digit, that mean you have to take care of all the heat that is not convert to light).  The life most likely is not due to LED itself but the overall design (good LED is expensive).  Just look at you highway LED billboard, you hardly see a single LED out, always a sector went dim, driver circuit got more trouble than anything else.  I would go with a vendor NOT claim with 50K life.  Sounds too marketing to me (5-10K may have better ring in my ear). My 2 cents. 
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Goodyear, Patrick [mailto:[log in to unmask]]
Sent: Monday, May 09, 2011 10:58 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] LED Microscope Ring Illuminators

We use both variable halogen and led light sources on our microscope
cameras.   The halogen tend to give a yellowish appearance to the
pictures and we use the camera contols to blue it out to a more true
color.   The led light source is on a slightly different camera with a
fixed iris, on this camera the LED tends to blind the camera, it does
however give a very true color although most of the time we have to run
it on minimum.  The LCD cameras are very sensitive to the lumins you
feed them, so a little goes a long way, even the halogen will blind the
camera on the newer circuit boards (lighter background), the halogen
cameras have auto iris, unfortunately they are not available in manual
(which I would prefer).   

Pat Goodyear 
Control technician 
Pacific gas and electric 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, May 09, 2011 9:17 AM
To: [log in to unmask]
Subject: [TN] LED Microscope Ring Illuminators

Hi All,

 

Do any of you use LED microscope ring illuminators? Good or bad? 

 

I know it's a cooler temperature light than halogen illuminators, but I
like what they claim life of the LED's are, 50,000 hours vs. 1,000 hours
for a halogen lamp.

 

I've never had the chance to use one, and I'd be interested in what you
think of them.

 

Thanks,

 

Steve

 

 



______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or
[log in to unmask]
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0 To
unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or
(re-start) delivery of Technet send e-mail to [log in to unmask]: SET
Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the
posts: send e-mail to [log in to unmask]: SET Technet Digest Search the
archives of previous posts at: http://listserv.ipc.org/archives For
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2