Using this Osram halogen bulb is easy. First, make sure the power to your downlight is turned off. Then, gently insert the GU10 base of the bulb into the socket. Once it's in place, turn the power back on. Note that these bulbs can get very hot during use, so avoid touching them when they're on or right after turning them off. Keep them away from flammable materials. For maintenance, just wipe the bulb with a dry, soft cloth when it's completely cool. If one bulb burns out, you have three more in the pack ready to replace it. Enjoy the great lighting these bulbs provide for your downlights.