Ceiling down lighters don't work, but bulbs emit low blue light - please help

[DetlefSchmitz]

Gable vents or windows perhaps?

Fair point.

 

[Harry Bloomfield]

Fair point.

But do they still remain alight, after dark?

 

[Nanny_D]

But do they still remain alight, after dark?

Yes very faintly. Not enough to light a room though as they are not even birthday candle bright.
Turning them on at the switch does nothing too.

 

[FrodoOne]

Hello. I'm not sure.
There seemed to be light in the inner bulb part too.

Yes.
A small amount of light,
leaking through the inside metallic reflector coating
BUT
not coming from the inside "filament"

 

[securespark]

Take the lamps out, then see if the light source is still there.