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 (ØxW): 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 AC/DC 12V: Compatible with 99% of