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. 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