When installing Locofi into a locomotive you may want to take into consideration the vintage or era of the locomotive, is it a steamer or diesel. Steam locomotives usually had warm colored headlights as well as early diesels while newer diesel units usually have a cool colored light.
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I installed Miniatronics Yeloglo* LEDs with a LocoFi 3 in an HO Kato NW2 and they look just right for my 1939 time period.
*Ultra Bright 3mm diameter 12-310-05 installed without resistors (it looks like resistors are built into the LocoFi 3 board).