First gently lay a pice of green paper over the white LED then wet it slightly. Then take a hammer and hit it until it starts glowing green. If you break the first one don't worry, just try again 'til you get it right.
I could go out a buy some in the right colour as suggested but I happen to have a few plain bulbs and I was wondering if there was a cheap money saving idea to colour up standard bulbs. I had overlooked the clear Tamiya paint solution and I do have some!
I also have enamel paint and thinners so I could give that a go.
What I don't want to do is obliterate the light altogether and a solution that is too wishy washy does not offer the desired effect. It is probably a trial and error situation.
Clearly there are lots of slot car aplications for the right solution.
The efficient answer is NOT to try to colour them directly at all, but to arrange a colour filter in front of them. That way, there is no need to worry about paint adhesion, changing colour (at least much more slowly) or overheating and shortening their already miserable little lives!
In addition, one can then easily replace the light source with a normal bulb when necessary, without having to consider its colour first.
If you watch a real traffic light maintenance engineer at work, I think you will find that all the bulbs are the same - no colour.
Just about any railway hobbystore will do 6v and 12v red and yellow LED bulbs. Maplin Electronics do several versions. But I think that you have to be aware of voltage and amps and mystery stuff like that otherwise they could blow, or not work very well.
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