delticjohn Posted March 7, 2013 Share Posted March 7, 2013 Hi All, Does anyone have any views on LED colours for yellow/amber signals? Amber is defined as being halfway between yellow. Looking at some of the Rapid LEDs they have some pure amber and soem orange (although none in SMD - which is sad) I'm presuming that orange will just look wrong, and was wondering whether I could filter yellow ones at all. Any thoughts welcome. As a supplemerntry does anyone have access to BS1376? If so what are the color wavelenghths appllicable to: Red, Yellow, Green Link to post Share on other sites More sharing options...
Pugsley Posted March 7, 2013 Share Posted March 7, 2013 Hi All, Does anyone have any views on LED colours for yellow/amber signals? Amber is defined as being halfway between yellow. Signals are yellow anyway, so not being able to get hold of amber LEDs isn't a problem Standard red and yellow LEDs should do you, the green is the one you have to watch - signal greens are towards the blue end of the range, where most green LEDs are towards the yellow end. Maplin did do some of a suitable colour, but I can't tell you the specific wavelength, I'm afraid. HTH Link to post Share on other sites More sharing options...
delticjohn Posted March 7, 2013 Author Share Posted March 7, 2013 Thanks for the reply. I know that they are classed as yellow but to me they always look amber compared to yellow LEDs.... especially the new LED ones Signals are yellow anyway, so not being able to get hold of amber LEDs isn't a problem Standard red and yellow LEDs should do you, the green is the one you have to watch - signal greens are towards the blue end of the range, where most green LEDs are towards the yellow end. Maplin did do some of a suitable colour, but I can't tell you the specific wavelength, I'm afraid. HTH Link to post Share on other sites More sharing options...
RMweb Gold beast66606 Posted March 7, 2013 RMweb Gold Share Posted March 7, 2013 Lamp based signals are difficult/impossible to reproduce accurately with LEDs. Not unsurprisingly LED signals are easier -the colours are, as expected, a lot closer. The signal head in the photo is lamp based. Link to post Share on other sites More sharing options...
Gordon H Posted March 7, 2013 Share Posted March 7, 2013 Standard red and yellow LEDs should do you, the green is the one you have to watch - signal greens are towards the blue end of the range, where most green LEDs are towards the yellow end. Maplin did do some of a suitable colour, but I can't tell you the specific wavelength, I'm afraid. For signal green I use Cyan LEDs, typically of about 505nm wavelength. Link to post Share on other sites More sharing options...
Horsetan Posted March 7, 2013 Share Posted March 7, 2013 For signal green I use Cyan LEDs, typically of about 505nm wavelength. Like these? Link to post Share on other sites More sharing options...
RMweb Gold The Stationmaster Posted March 7, 2013 RMweb Gold Share Posted March 7, 2013 Here's an LED yellow in a signal head (subject to the camera's white balance setting and your screen settings of course) And here's a green (similar caveats obviously) Link to post Share on other sites More sharing options...
Stephen Freeman Posted March 7, 2013 Share Posted March 7, 2013 Hi, You can use suitable Tamiya clear acrylics to modify the colours of leds if you wish. Amber works pretty well on white leds to reproduce a softer light more suitable for oil lamps. Link to post Share on other sites More sharing options...
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