Avena LED MR16 and GU5.3 are both types of light bulbs commonly used in lighting fixtures.
MR16 refers to the bulb’s size and shape. It has a diameter of 16 eighths of an inch, which is approximately 2 inches (50mm).
GU5.3 refers to the type of base used in the bulb. GU5.3 is a bi-pin base with a 5.3mm spacing between the two pins. The pins are pushed into corresponding slots in the socket to make the electrical connection