I used the 3mm. I did happen to get the even smaller 1.8 LED as well. They are almost as small as the LED's on some decoders !! I swear When I get older I'm going to have to move to HO or lots of Microscopes ! The battery pack/holder doesn't quite fit in the car either. Applying tape around it to hold the battery in is hard. I like that it comes with a installed switch. Can't wait to wire the switches !
@MK SMDs !!! Those are really small. The look would be well worth it though. I love HO but with the amount of space I might/will have I would love to have longer trains the bigger trains if that makes sense. Also more trackwork is fun. @mtntrainman Nice !!! They look similar to welding helmets ! Does your skull feel famished after some time ?
I do have to give my eyes a break about every 5-10 minutes...LOL. The Optivisor fits nicely. It has an adustable headband and is comfy enough to wear...
Some SMD LEDs, especially those on eBay come with soldered leads so you don't have to deal with doing that.