Use TransformerNotePlease make sure the transformer is compatible with the LED bulb. Incompatibility will cause the light bulb to blink. If a traditional halogen transformer is used, all the bulbs connected must reach the minimum output power of the transformer. Energy savingMR11 GU4 3.5W LED bulb can perfectly replace the halogen bulb 25- 35W, saving up to 90% on your lighting electricity bill. Lifespan is up to 25,000 hours, which will reduce costs by reducing replacement frequency. It can only be used under 12V. High CRI, healthy atmosphereCRI> 80 Ra, high color reproduction, free of lead and harmful mercury, CRI> 80 ensures vivid visual enjoyment with original colors. No harmful radiation, no UV or IR. Wide ApplicationStandard MR11 base, easy to install on all MR11 base fixtures. MR11 3W LED bulb can be used in track lighting, landscape lighting, recessed lighting, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.