Good bulbs. Don't touch the glass part when installing as the oil from your fingers will cause the bulb to burn out almost instantly which I learned the hard way twice. Also no 3 way bulbs but works great in an old bulb left by my landlord. These types of bulbs seem to last a very long time as we used the last bulb almost daily for 2 years, but I don't know how long it was in use before we moved.