> From: James Holland > Subject: [EE] Selecting a green LED > I'm looking to select some green LEDs for a clock that will be used outdo= ors. Looking at the catalogues I can get various wavelengths and the highes= t light output appears to be from those with a more yellow output, around f= our times that of a pure green LED. The clock has a green filter which I wo= uld guess is closer to a pure green. Am I likely to be better off with a lo= wer power pure green LED or a higher power yellow/green LED. Unfortunately = I don't have any real data, the display was removed from a clock so the exi= sting LEDs are an unknown quantity as is the filtering capability of the fi= lter so I'm really just hoping for general information based on other's exp= eriences. > Regards > James > ------------------------------ >=20 > Message: 6 > Date: Mon, 30 Sep 2013 09:00:51 -0700 > From: > Subject: RE: [EE] Selecting a green LED > To: "Microcontroller discussion list - Public." > Message-ID: > <20130930090051.06a56fd6300ec2bfca6379d4e10ab8d2.ff383952bb.wbe@email01.s= ecureserver.net> >=20 > Content-Type: text/plain; charset=3D"utf-8" >=20 >=20 > Buy a few pieces of each variety, connect them to a power source, and > put them behind the filter=20 > to see which is the better performer. Then buy enough to finish the > project. >=20 > Regards, >=20 > Jim >=20 =20 The LEDs are in a 3mm package. I didn't get a chance to look at this again = yesterday but I did manage to scrounge a few LEDs that were still in their = original packaging so I have a part number and a spec for those so I will f= it a couple, see how they compare and go from there. I am curious about how= much of the 'extra' yellow light will make it through the filter which is = more of a pure green colour, In the past I have always used LEDs as indicat= ors only, stuck through a panel with no filter. When I get the timer apart= again I will post some pictures.=20 Regards James =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .