I bought a 4100K 18W bulb. They replaced the standard bulbs in a Panasonic Whisperwarm bathroom fan. The stock headlights lasted about 2 1/2 years and weren't very bright, more of a yellow light. This is a bright white light that I prefer. It's a noticeable improvement, but time will tell how long it lasts. The purchase is justified for the price
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12 Review