These MR16 type bi-pin 12V spot light LED bulbs contain 20 pieces of LED to produce about 30~40 lumens, comparable to a 10W 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 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 435KWh of electricity, which translate into $52 savings in electricity bill and 583 pounds of carbon dioxide emission. Using just 1.3W, 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: 1.3 Beam Angle: 90? Lumens: 30~40 Equivalent halogen bulb wattage 10W LEDs: 20 pieces of LED Usage: Spot lighting, recess lighting, tract lighting, reading light Size: 2.1" H x 2.0" 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 1.3W. 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.