Modified spectrum means it has a coating that alters the original spectrum. Like the GE Reveal bulbs for example. In the case of the halogens, they have a slightly pink coating. It's how they get away by using lower efficiency standards permitted for modified spectrum lamps. The GV bulbs are made by Sylvania in the St Mary's PA plant, with capsules made all over the world. Some are made in the USA, some made in Germany, some made in China.
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