Question: is mr16 same as gu5.3?
Answer: Halogen MR16 Bulbs (aka MR16 or GU5. The 5.3 in GU5. 3 means that there is a distance of 5.3mm between the two pins. If you would prefer to upgrade your Halogen MR16 to LED equivalents, make sure you read our guide to replacing halogen MR16 spotlights with LED.