On 20/10/2019 14:10, Dave Plowman (News) wrote:
In article ,
Martin Brown wrote:
Quartz halogens may be dimmable but the recycling mechanism that keeps
the internal glass surface clean doesn't work if they are run too cool.

I keep on reading this. Yet to experience it in practice. With a vast
range of halogen types, both mains and LV, all on dimmers.

Only time I've seen blackened halogen is car headlight bulbs. And not many
cars have dimmers.

They used to have a "dim dipped" function, where the headlamp bulbs were
wired in series when you had the side lights and ignition on. It was
even a legal requirement I believe, in the late 80s and early 90s.

--
Max Demian