What is the difference between G24q and GX24q bulbs?

The primary difference between G24q and GX24q bulbs lies in their base design. G24q bulbs have a square base with pins that are arranged in a straight line, while GX24q bulbs have a similar square base but with the pins arranged in a slightly offset manner, which allows for a twist-and-lock mechanism. This difference affects compatibility with fixtures; thus, they are not interchangeable. Both types are used in compact fluorescent lamps (CFLs) and some LED replacements.