We have a whole sub-forum on Signalling matters under the "Track, Layouts and Scenery" heading. There is some discussion on colour-lights there. You might like to go and have a look. If your query isn't answered by anything there, post another query in that area so that those of us with an interest in signalling see it.
The 'Search' function on this Forum (Top right of the page) works well and is another way of finding information among the mass of stuff on this site. Have fun looking!
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