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Brightness is a description of light output, which is measured in lumens (not watts). Light bulb manufacturers include this information and the equivalent standard wattage right on the packaging. Common terms are "soft white 60," "warm light 60," and "60 watt replacement." Sometimes a diagram will show two images or an equal sign, much like the packaging image to the right.
To save energy, find the bulbs with the lumens you need, and then choose the one with the lowest wattage. You can also look for a bulb that is labeled as equivalent to the standard bulb you are replacing.
