That light is listed in the MACK PRODUCTS web site,www.mackproductsrc.com, in thier lighting section as either #L20 or #L21 and they sell replacement bulbs for either light as #LR34. Yes the light s are rated at 3 volts each. If you take a sharp Xacto knive and pick around the lens it will lift off allowing you to replace the bulb inside. You are right all the lights are top quality.