Energy saving: Save up to 90% on your electricity bill with LED lighting. Replace 35-40W halogen bulbs with 3W LEDs. Now with LEDs for a truer and more natural color experience. Long Lifespan: 12V AC/DC more stable than 12V DC LED bulbs, operating range with a lifespan of 30,000 hours, 25 times longer life than incandescent bulbs. High Power 24 SMD 5730 LED Chip: Low power consumption measured at 3W producing 400 lumens, the quality of 5730 chip is better and more stable than 5050, 3528, 2835 chip. Suggestion: These MR11/GU4 LED bulbs can only be used for 12V (AC 12V and DC12V). Please note that these LED bulbs are not dimmable, please never use them with a dimmer switch or unstable 12V system, otherwise they will flicker or make noise and then be broken quickly. We always suggest you use a LED power supply or LED transformer to connect LED bulbs. (Never use halogen transformer, electronic power supply, halogen power supply). High quality lighting: no flickering, no buzzing and no