LED spotlight AC 12V / DC 12V: it is best to use an LED transformer.If you want to connect a halogen transformer, make sure that all the power of the LED bulbs reaches the lowest power of your transformers, otherwise they may flicker strongly MR 16 / GU5.3 / GX5.3 5W LED replaces 50W halogen, 450Lumen, Voltage AC 12V / DC 12V (AC12V or DC12V LED transformer required), Non-dimmable, Dimensions (xL): 50 x 39 mm Durable GU5.3 reflector: with CE, EMC and RoHS certification.No flicker, no UV or IR radiation.Made of high quality materials with excellent heat dissipation 12V 50W Cold White Floodlight: high reflection index Ra80 with SMD super 30 x 5730, uniform lighting.Energy efficiency class A +, long life, energy saving up to 90% Be careful!!Please make sure your transformers are LED or halogen transformers, if they are halogen transformers, they may cause the MR16 LED bulbs to flicker, consider replacing them with an LED transformer. Save your electricity bill MR16 5W LED bulbs, 50W equivalent halogen bulbs Save 90% on your electricity bill Snapshot Install the bulbs directly into the fixtures Instant start without lag No lead or mercury, no UV and IR, safe to use Easy installation Easy installation, can be easily installed in place of ordinary bulbs with MR16 GU5.3 base.