Do you use incandescent or LED lighting in your locomotives . For LED lighting do you use warm white (3000k) or daylight (5000k). I have a few old locomotives that just have the old 12v incandescent lamp in them and would like to go to LED or 1.5v incandescent with a DC-DC converter. I am currently running DC on my layout so withthe converter , the lamp would be at full brightness before the locomotive moves.