I have a lamp that was given to me that asks for a "grade A" light bulb, but I haven't found light bulbs that specify a grade.
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The base which often is called standard light bulbs has a fat screw-in base. This usually has in small print on the package, A60 if it is a 60 watt.
In comparison I have chandelier bulbs with the skinny base which are called B60.
In comparison I have chandelier bulbs with the skinny base which are called B60.
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Incandescent light bulbs will never qualify as class A efficient.