Hi! I have a headband magnifier for working with tiny models, and it has two lights on it, one on either side. Each is self contained with a switch and battery connectors for 2 AAA batteries, and a small incandescent bulb (see pic). What I would like to do is hack this and make it use LEDs I am "ok" with certain skills, like soldering and such, and have the tools. I am hoping someone can tell me what LEDs I can use and resistors I might need to make this work within the existing housing. Thank you!!