Yes it is from the bulb. And yes it’s also oily here. It also appeared second time, but still no third time.
I wrote to support and they suspected it’s water vapor condensate, but
drops of water on bulbs would appear again with the same climate conditions (which I tried, they did not appear again)
air conditioner actually dries air
given drops of liquid on bulbs are oily and don’t completely dry when they drop on a surface. Water is not oily, water condensate is water.
when condensate appeared on one bulb it should also had appeared on all other 5 bulbs in the same room
I suspect two things
- plastic degradation (maybe with specific climate conditions required)
- electrolytic capacitors inside the bulb
But for the 2. bulb looks tightly closed, so only if plastic can let electrolyte through,which I don’t know possible or not.