MR16 & GU10 Light Bulbs and Their Sockets

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GU10 Light Bulbs

MR16 (GU5.3) and GU10 Light bulbs are popular in homes and businesses for spotlights and downlights. In stores, these bulbs often use a focused light beam, narrower than 45 degrees, to highlight products. They are sometimes called PAR16 or PAR20 because of their small size, though the latter type usually has a screw socket.

In many Australian homes, you’ll find 12V 50W MR16 bulbs or 240V GU10 50W dichroic halogen bulbs used in ceiling lights. Our LED versions of these bulbs can save you 75% to 90% on electricity and reduce heat by up to 80%. This means you could cut down your lighting bill significantly and save up to 30% on air conditioning costs because of the lower heat output.

MR16 and GU10 bulbs have different sockets. The MR16 uses a 12V low voltage transformer, while the GU10 plugs directly into a 240V AC mains socket without needing an extra transformer. Both are safe, but it’s nearly impossible to get shocked by the MR16 socket, while the GU10 could potentially cause electrocution if you stick a metal object in it, though it’s very unlikely.

Both bulb types use the same LED technology, which might be in the form of several small LEDs together or a single larger LED (COB). The COB design aims to mimic a single light source, creating a sharp shadow, unlike older MR16 LEDs that produce a softer, less defined shadow.

Using MR16 LED Bulbs with Old Transformers

MR16 LED bulbs work with most 50W halogen transformers. You can find compatibility information on our list or send us your transformer for testing. To save more electricity and prolong your LEDs’ lifespan, especially in commercial settings or high-usage areas, we recommend replacing your old transformer with a new 12V DC LED driver. For residential use, the GU10 LED is generally the best value.

If you need to replace your halogen transformers, you must hire a licensed electrician unless they have a plug that allows for easy replacement. MR16 LEDs are easy to insert, while GU10 bulbs require a push and twist to fit, similar to standard light bulbs. Changing a bulb usually doesn’t need an electrician, unless it involves wiring.

Remember to check if your current light fixtures have enough space for these LED bulbs. Some models are longer to accommodate a larger heat sink and might not fit. If space is tight, choose a shorter LED bulb or get a compatible fixture from us.

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