I don't have a scientific method to measure the brightness of this bulb. Subjectively, the brightness is not 100 watts. I had a 60 watt bulb in my light fixture while awaiting delivery of this bulb and this bulb doesn't look any brighter than the 60 watt bulb it replaced. On the plus side, it's a nice size and shape; The glass is clear and clean, the bulb works well in a dimmable fixture. Arrived well packaged, no damage. It's just not very bright, and I really wanted a good 100 watts of light. I feel like it's overpriced, but since Home Depot and Lowe's don't go well together at the moment, there's not much to do.
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