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These 9volt LEDs I purchased are for building/scenery lighting. Like for the blinking tower lights and the white ones for illuminating the inside of buildings like our switch house and control tower. I thought using a covered 9 volt battery holder with an on/off switch could be used and easily extended to a convenient location on the layout to operate. I have never used or worked with LEDs before and all the small soldering and shrink tubing along with figuring out which resistor to use was turning me off until I saw these neatly made prewired ones.