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Old 4th Mar 2019, 11:28 am   #5
Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 3,730
Default Re: Lamps for lamp limiters

I hadn't come across traffic light bulbs before, but I guess that what makes them particularly suitable for traffic lights is the compact filament arrangement. That would allow a highly directional beam to be produced when the filament cluster is accurately aligned at the focus of a parabolic reflector.
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