MR16 vs MR11 bulbs are not the same; they differ in size, base type, and light output.
MR16 bulbs are larger, with a diameter of 2 inches (50mm), while MR11 bulbs are smaller, with a 1.375-inch (35mm) diameter,
making them incompatible due to their size difference.
The "MR" stands for "multifaceted reflector," and the number indicates the bulb's diameter in eighths of an inch,
with MR16 being 16/8 inches and MR11 being 11/8 inches.
Comparison of MR16 and MR11 bulbs
| Feature | MR16 | MR11 |
| Diameter | 2 inches (16/8 of an inch) | 1.375 inches (11/8 of an inch) |
| Pin Base | Most commonly a GU5.3 base, with pins 5.3 millimeters apart. | Most commonly a GU4 base, with pins 4 millimeters apart. |
| Light Output | Higher wattage and lumen output, providing a brighter, broader beam of light. | Lower wattage and lumen output, providing a more focused, narrower beam of light. |
| Used | Versatile for general and task lighting in larger residential and commercial spaces, such as track lighting, retail displays, and landscape lighting. | Ideal for accent lighting in smaller, more confined spaces, such as display cases, cabinets, and small art installations. |
| Interchangeable | No. Because of the size and pin base differences, an MR16 will not fit into a fixture designed for an MR11. |
Check the base: Always inspect the existing bulb or the fixture to determine the correct pin spacing and diameter.
Voltage: Both types of MR bulbs can operate on either low voltage (typically 12V) or line voltage (120V in the U.S.). The base is different for each: low-voltage bulbs use bi-pin connectors (like GU5.3 or GU4), while line-voltage bulbs have a twist-and-lock GU10 base.
LED vs. Halogen: If you are upgrading from a halogen bulb to a more energy-efficient LED, ensure your fixture's transformer is compatible with the lower wattage of the LED.
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Is MR16 the same as MR11? MR11 vs MR16 bulb is n
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