hello everyone, new to the forum and pretty much led's, i have a small conductor lamp that i use on the railroad for switching boxcars, anyways its made byStreamline Products out of Missiouri, it runs on 2 D batteries, and has a spot screw-in e10 and a round screw-in e10 bulbs, the spot i need for riding cars into tracks too see greater distances and the more 360 for giving lamp signals to the engineer and for reading switchlists. so i would like suggestions on which e10 screw-in bulbs to get and from where please? like i said i need a good spot for distance and a good wide beam for giving signals to the engineer who could be upto 1000 feet away, thanks again guys, any help is appreciated.