AC/DC 12V LED spotlight: It is best to use an LED transformer. If you want to connect a halogen transformer, make sure that the total power of the LED bulbs reaches the lowest power of your transformers, otherwise there may be severe flickering MR 16 / GU5.3 / GX5 LED replaces 30W halogen, 450 lumens, voltage: AC/DC 12V (AC12V or DC12V LED transformer required), not dimmable, dimensions (ØxL): 50 x 46 mm Durable GU5.3 reflector: with CE, EMC and RoHS certification. No flickering, no UV or IR radiation. Made of high quality materials with excellent heat dissipation 12V 30W warm white floodlight: high reflection index Ra80 with SMD Super 30 x 5730, uniform lighting. Energy efficiency class A+, long service life, energy saving up to 90% Service: Attention! ! Please make sure your transformers are LED or halogen transformers. If they are halogen transformers, they can cause the MR16 LED lamps to flicker. Consider replacing them with an LED transformer. Product Description Product