Check the packaging of your LED light for information about the brightness measured in lumens. Standard LEDS are available in a range of 50 to 1200 lumens of brightness. One lumen is equal to the amount of light a candle (standardized as one candela) lets fall on 1 square foot of area, 1 foot away.
Find information on the packaging about wattage. You may see two different wattage measurements for your light, stated in the format: "75 watt-equivalent, 9-watt LED." The watt-equivalent measurement shows you what wattage of incandescent light you would need to get approximately the same brightness as this LED lights. The real wattage (or power requirement) of the LED is much lower since LEDs use power much more efficiently than incandescent bulbs.