A GU10 light bulb is a bi-pin base lamp that typically provides a directional source of light for commercial accent lighting in retail, museum and hospitality spaces, as well as for household use in track lighting and recessed downlighting. The designation GU10 refers to a twist-and-lock base which has two pins spaced 10-mm apart. The bi-pin base is used for mains-voltage applications. The second letter in the designation stands for “universal”. Assuming the center-to-center distance between two pins is the same, GU bases will safely fit into GU, GY, GX and GZ light fixtures. For instance, GZ10 fixtures can use GU10 bulbs, but not vice versa because GZ10 is not a ‘universal’ fitting. The GU10 light bulb is technically a directional lamp with a GU10 base. The directional lamp that uses a GU10 base is more often an MR16 bulb.
at the Open Lighting Product Directory (OLPD)
