These MR-11 type bi-pin 12V spot light LED bulbs use one single piece of 2W HEHO (High Efficiency High Output) LED emitter to produce about 80~90 lumens, comparable to a 25W halogen bulb. This bulb is about 3 times as bright as the cheaper 12 LED MR11 bulbs! It also lasts over 50,000 hours. If you keep it on 8 hours a day, 365 days a year, it won't burn out in 17 years! Each halogen bulb cost about $5 with average life around 1000 hours. This bulb cost about the same as a typical halogen bulb but lasts 50 times longer. That's over $200 saved in bulb replacement cost! Plus, over the life of this bulb it will save you 1150KWh of electricity, which translate into $138 savings in electricity bill and 1541 pounds of carbon dioxide emission. Using just 2W, this bulb barely generate any heat and will extend the life of your lighting fixture over time. This LED bulb produces a cool white color (6000K) similar to cool white fluorescent tubes. It's great for places where you wish for natural daylight lighting! Detailed Specifications: Socket: 2 pin 12V MR11 Volts: 12V Watts: 2 Beam Angle: 90? Lumens: 80~90 Equivalent halogen bulb wattage 25W LEDs: 1 single piece of HEHO LED emitter, highest efficiency! Usage: Spot lighting, recess lighting, tract lighting, reading light Size: 1.3" H x 1.4" Dia. Warranty: 2 Years Volume discount available! *May not be compatible with a small number of fixtures that use electronic transformer (ballast) that has minimal wattage requirement, because this bulb uses only 2W. All magnetic transformers (ballasts) are compatible. All electronic transformers that do not have minimal wattage requirement will work with this LED bulb too. If in doubt, purchase just one, try it out and return it for full refund if it doesn't work.