A tiny E5 or E5.5 size is only used for extra-low voltages, such as in interior illumination for model buildings, and model vehicles such as model trains. These are often called "pea bulbs" if they are globe-shaped, but they commonly look like sub-miniature Christmas bulbs, or large "grain-of-wheat" bulbs.
Tiny E5 or E5.5 size light bulbs are only used for low voltages, such as in interior lighting for model buildings and model vehicles like model trains. They are often called "pea bulbs" if they are globe-shaped, but commonly resemble miniature Christmas bulbs or large "grain-of-wheat" bulbs.