If you want to run a lot of street lights, then grain of wheat bulbs aggregate pretty quickly. By the time you've got 20 or 30, that's actually adding up to a fair amount of current. There are other chinese suppliers - www.hezhiqing.com is my preferred one, that will sell you cheap warm white LED lamps and lights.
There are a lot (and more to follow) on mine, so in the end I went with a 12v 5A separate supply from cpc.farnell.com - PW0391003 . You should expect to cut off the plug and wire it into something you can use. Also means all the things meant to run trains only do that.