
These are standard 78mm bulbs in the box. As described by the seller, It can be used for at least 2 years, no more than 3 hours in a day, I don't know because I don't use it for a long time, I hope it can be used perfectly, you can install this kind of lamps really get into the fixture without making proper contact with the terminals, which is often the reason new bulbs look bad or flicker. When old bulbs start to flicker, it's a good sign that they're about to fail and the bulbs seem to be out to be of good quality and none of them broken Nice to get 5 bulbs for a total price of $10.

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