I just received these bulbs today. Put the first did not help. Ok, maybe 1 bad. Tried another one, same thing. Okay maybe 2. But I tried ALL TWELVE and none worked! And I'm 100% sure it's not a bad contact, it's not a bad socket, it's not a bad lamp socket. I just removed a perfectly working LED bulb to put it in. I only used LED until I got the right type. I don't feel the need to return them because they DO NOT WORK! Will update this review once I get a response from the seller. If I could I…