I bought these to replace 2 bulbs in an old random bulb and they worked great. It's nice to know that all of those 15-watt bulbs are pretty much interchangeable. It would be nice to use LED bulbs instead, but it's cheap to just swap out the bulbs. I still don't understand how 2 packs of these bulbs cost half a bulb from most other suppliers. I wanted a 4000K color but for 1/4 the price of a lightbulb I figured I could adapt. The lights themselves are very bright. Significantly brighter than what they replaced. I am very satisfied with the result.
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