Answer
Oct 29, 2025 - 08:10 PM
In light bulbs, “GU” refers to the type of base or socket connection. The number that follows, such as GU10 or GU5.3, indicates the distance in millimeters between the two pins on the bulb’s base. This standardized system helps determine fixture compatibility and ensures you select the correct LED or halogen bulb for your lighting setup.
