This bulb was very difficult to screw into the socket. So I bought high dielectric silicone grease (on Amazon) and was able to screw it in. Unfortunately it didn't burn. I tested the cartridge by screwing in standard GE and Philips bulbs (no shades). Both went in easily (needed no lubrication) and caught fire. I then tested the lightbulb by connecting wires to it and it glowed. So that should work, but it seems like the lamp base isn't long enough to touch the bottom of the socket. I don't have this problem with two well-known brands and I can't screw the bulb deeper into the socket or it will break. Conclusion: a useless lightbulb; low quality. Beware.
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