Bought these for a floor lamp with an E12 work lamp fitting. They're about 1/4 inch longer than typical E12 bulbs, which I don't see as a problem at all. I was concerned that her white top would dim the light but there was no problem. The light penetrated very well. I love the daylight color which provides natural colors at night and reduces eye strain. Definitely as bright as a regular 60W bulb.