My experience is you have to keep searching and sampling. After about five or six misses, I finally got a batch of 2700K 3mm LED's that are just what I wanted for steam headlights. The 2700K LED have almost exactly the color temperature of an incandescent bulb, which was the effect I was going for.
I have a package of 35 3mm warm white LEDs; they are rated for 3-3.4V, 24mA, and 8000mcd if it helps. I also have a salvaged light harness from a Lionel GP30 (#6-28862) which has LED front/rear headlights and rear LED marker lights.
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