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I like to use 1.5 mm yellow LEDs for industrial lighting. They look a lot like soda vapor lights, and the shape lends itself to being painted to give you a "fixture".https://www.ebay.com/itm/50PCS-1-5mm-Dip-Water-Clear-Round-Top-Yellow-Super-Bright-Light-Lamp-LED-Diodes/323028311177?epid=517131107&hash=item4b35fcdc89:g:Dy4AAOSwEAtZYzcZIt's kind of a rectangular shape with a round "globe" in the center of it. And with a listing such as the one shown here, you can get a large number of them at a very reasonable price. If you hunt around a bit you can find them with accompanying resistors so you don't have to worry about Radio Shack being kaput. They're also available in packs that provide multiple colors, so you can warm white, cool white, blue, green and red where you might want such things. (Alarm boxes with red lights, blue lights for work warning lights, green for the spooky funeral parlor on main st. etc.)I wire mine to a 9v wall wart transformers. If you use AC, you don't have to worry about polarity, but I believe DC makes them last longer. You can also wire 12v rated incandescents into the line as well.I was just getting around to running a lighting bus wire around the layout when the time came to tear it down, so the local wall warts were handy for lighting different areas.Lee