Hi Bill: For years I've been searching the Jameco catalog for low current LEDs, and in Catalog 244 they are stocking units speced for 1 and 2 ma. I have tried using other LEDs at reduced current and so far all of them have shut off at the 2 ma level (or they are so dim by comparison to a "true" 2 ma LED that it's the same as being off). These are all rated at 1 or 2 ma: Jameco # p/n 253690CR HLMP-1700 253729CR HLMP-K150 253681CR HLMP-1790 253673CR HLMP-1719 253817CR HLMP-4700 253850CR HLMP-D150 253833CR HLMP-4740 253825CR HLMP-4719 My guess is that Jameco got a good deal on a remainder lot. It's too bad these are not being made any more because for battery powered devices the low current LEDs are the way to go. Have Fun, Brooke Clarke, N6GCE -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Date: Mon, 17 Jan 2005 14:50:27 -0800 From: William "Chops" Westfield To: "Microcontroller discussion list - Public." Subject: [EE] Low current LEDs - Obsolete? Message-ID: <2E8A6948-68DA-11D9-87CD-000A95E5DF26@mac.com> Content-Type: text/plain; charset=US-ASCII; format=flowed MIME-Version: 1.0 (Apple Message framework v619) Content-Transfer-Encoding: 7bit Precedence: list Reply-To: "Microcontroller discussion list - Public." Message: 29 [with correct tag] There used to be a bunch of "low current" LEDs (~2mA recomended current, IIRC) such as the HLMP-47xx series. With the advent of superbright LEDs, are these essentially obsolete these days? With brightness usually being relatively linear WRT current, an easily available 2000mCd (at 20mA) superbright ought to easily outperform a 3mCd (at 2mA) "low current" device, right? Thanks Bill W -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist