With the emergence of many new lightbulb technologies, the wattage is not really an accurate measure of how bright the light will be – you may have noticed how compact fluorescents come with labels saying things like 15W is 60W equivalent. To avoid the confusion, new labels will list the brightness in lumens, which is the SI unit of light power as perceived by a human eye. There will also have to be information on the bulb’s expected lifetime, energy cost, color temperature (like fluorescent is usually “cold” or tungsten is “warm”), wattage, and mercury content. The lumen brightness and the mercury content would be on the lightbulb itself besides the packaging.
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