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 strongly MR 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 mm Durable Reflector GU5.3: With CE, EMC and RoHS certified. No flickering, no UV or IR radiation. Made of high quality materials with excellent heat dissipation 12V 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 Description product AC/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 spotlight Please 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 strongly Great 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 bulbs Save 90% on your electricity bill Instant Install bulbs directly into fixtures Instant on with no lag No lead or mercury, no UV and IR, safe to use Easy installation Easy installation, can be easily installed instead of ordinary bulbs with MR16 GU5.3 base