There is a right and a wrong way of connecting LEDs into an electrical circuit. The long leg connector should be connected to the wire from the plus end of the battery and the short leg should be connected to the minus end of the battery. LEDs can be fiddly to use and more fragile but you do not need a bulb holder and their size means a smaller light source on a model. 8mm LEDs. Colours in pack: yellow, green and red.10 of each colour supplied, total pack size 30
Just what needed. Thank you.