These MR-11 type bi-pin 12V spot light LED bulbs use 12 pieces of LED emitter to produce about 25~30 lumens, comparable to a 10W halogen bulb.?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! Using just under 1W, 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 MR11 Volts: 12V Watts: 1 Beam Angle: 90? Lumens: 25~30 Equivalent halogen bulb wattage 5~10W LEDs: 12 pieces of LED 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 1W.?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.