These MR16 type bi-pin 12V spot light LED bulbs contain 1 single piece of HEHO (High Efficiency High Output) LED to produce about 80~90 lumens, comparable to a 20W halogen bulb. LED MR16 bulbs 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 twice as much 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 900KWh of electricity, which translate into $108 savings in electricity bill and 1206 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 green glow Detailed Specifications: Socket: 2 pin 12V MR16 Volts: 12V Watts: 2 Beam Angle: 60? Lumens: 80~90 Equivalent halogen bulb wattage 20W LEDs: 1 piece of 2W HEHO LED emitter Usage: Spot lighting, recess lighting, tract lighting, reading light Size: 2.1" H x 1.9" 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.