headlights

Hi there just wondering what color LED's you guys have used for your steam locomotive's thinking on changing to LED's. Thankyou model trains 2021.

I have a Athearn RTR SD40-2 that has burned out headlights. Looking for suggestions on what to replace them with. I would like something that will last awhile, possibly a LED? I have tried to search on-line but there are a lot of different choices and I am not sure what size I actually need...

I just installed a DCC Decoder in my GP-38, that I took from another GP-38. It runs fine, and the headlights come on, but when I'm going forward, the back comes on, and when going backwards the front comes on! How do I stop this from happening and fix it to how it should be? Any help would be...