It is compatible with existing gu10 lighting fixture. Installation method : Turn off the power of the lamps. Dismantle the old bulb . Put led bulb back to the lamp stand and rotate to fix the bulb . Check again if bulb and reflector are in proper position before power on. Caution: Avoid moisture inleakage which will lead to a short circuit and cause a damage. Do not detach the bulb while power is on to avoid a electric shock. Avoid collision with any object. This product is not suitable working under high dust, high salt harms or temperature higher than 60 degree centigrade environment Don't dismantle the led bulb , by doing so will lead to void warra nty. The led bulb is a recyclable product. Warranty for 20, 000 hours in condition of normal usage. Natural disaster is not covered