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Old 26th May 2021, 11:40 pm   #56
broadgage
Nonode
 
Join Date: Jan 2010
Location: North Somerset, UK.
Posts: 2,129
Default Re: Crompton 60W bulb

Quote:
Originally Posted by kirstyd View Post
My gran used to work as a cleaner at the local ODEON she would bring coloured bulbs like this home .Would they have been used in the concealed lighting perhaps and possibly used with dimmers ? .Some of the bulbs had three prongs on them instead of the usual two
Yes quite possibly, cinemas used to have an array of coloured lamps decorating features both in the auditorium and in external signage.

It was common practice to replace all these lamps, working or not, either after a set time, or when a certain percentage had failed.
The used but still working lamps would likely have been a staff perk.

3 pin bayonet caps were used for various special purpose lamps, including 75 volts (railway trains), 160 volt, 80 watt (ballast lamps in series with fluorescent tubes), smaller mercury vapour lamps (shop window lighting), and twin filament lamps (railway signals, operating theatres)

Don't think that I have ever seen a coloured but otherwise standard lamp with a 3 pin cap.
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