AC / DC 12V LED spotlight: it is better to use a LED transformer. If you want to connect a halogen transformer, please make sure all the power of the LED bulbs reaches the lowest wattage of your transformers, otherwise they may flicker stronglyMR 16 / GU5.3 / GX5. 3 3W LED Replaces 30W Halogen, 450Lumen, Voltage: AC / DC 12V (AC12V or DC12V LED transformer required), Not dimmable, Dimensions (xW): 50 x 46 mmDurable Reflector GU5.3: With CE, EMC and RoHS certified. No flickering, no UV or IR radiation. Made of high quality materials with excellent heat dissipation12V 30W Warm White Floodlight: Ra80 high reflective index with super 30 x 5730 SMD, uniform illumination. Energy efficiency class A +, long life, energy saving up to 90%Service: Attention Please make sure your drivers are LED or halogen drivers, if they are halogen drivers, they may cause the MR16 LED bulbs to flicker, consider replacing them with a LED driver.Product productAC/DC 12V: Compatible with 99% of transformers. LED transformers or halogen transformers can be used. The use of halogen transformers must achieve a minimum power requirement. If you are not sure what type of transformer you have, you can plug in a halogen bulb.AC/DC 12V LED spotlightPlease ensure your transformer is compatible with the GU5.3 MR16 LED bulb. If you want to connect a halogen transformer, make sure all the power of the LED bulbs reaches the lowest wattage of your transformers, otherwise they may flicker stronglyGreat choice 3W MR16 GU5.3 LED Spotlight Bulb Excellent color consistency, high quality lighting performance is ideal for use in places that require more intense light.Save your electricity bill 3W MR16 LED bulbs, 30W equivalent halogen bulbsSave 90% on your electricity billInstantInstall bulbs directly into fixturesInstant on with no lagNo lead or mercury, no UV and IR, safe to useEasy installationEasy installation, can be easily installed instead of ordinary bulbs with MR16 GU5.3 base