You are quite right of course , I am 64 years old -- so I go way back , when it comes to Sci-fi and that includes StarTrek in all its versions ( preference split now between TOS and TNG ) and when talking about electronics I am not a professional I'm self taught, books and general modelling - fiddling about ! Over the last 40 years I have seen a vast number of components come and go , some you can still get if you search, some have 'ceased to be ' in the words of Python , and it was these last few I was referring to . In the UK a Kingbright tombstone led for example is priced at £6.98 or $9.13 each , if and I repeat if you can buy one . The remainder have ' disappeared off this mortal coil' and it was those that I was totally referring to, Since I am not made of money , I decided to see if I could produce a matched led of my own making starting with a baseline 3mm water clear hi bright , clear cast , colourants and vitrolglass paints ( which have a colour wheel and can be mixed to produce different colours .)
I consider myself very lucky to have linked to a fellow member of the forum who happened to have worked in production and had a full set of original led's which he has kindly let me borrow . This meant I could do three things , cast them to the exact size used , secondly colour match the led , and thirdly match the luminosity . This I believe I have done and the feedback I have received so far confirms I have a very close , if not almost exact copy.
I have detailed exactly how I achieve this for others to follow if they wish , I have left out one ingredient in the process , which I believe gives me the unique 'glow" to the led , my grandson called it ' lumi-glow' which describes it perfectly , unfortunately my iPad camera doesn't really do it justice as its much better when you see the real deal. I will be posting videos when I have my Tricorder finished.