LED not working on some sockets
I don't what could be wrong, what do you think?


I think it is probably incompatible with some other device on that circuit, such as a dimmer, a switch-locator or something else.

If this is the case it may be best to take/send the bulb back to the retailer and change it for a dimmer-compatible LED bulb.



It might be that your E27 to E14 adapter only makes proper contact when gravity is pushing the bulb into the adapter (standing upright) instead of pulling out away (hanging down)

If this is the case, I'd replace the E27 bulb with one that has an E14 fitting to match your ceiling fittings. Or change the ceiling fitting to one that takes E27 bulbs.