strobing

[Steve Walker]

Yes, even more so as they pass across your peripheral vision - horrible and occassionally distracting.

SteveW

[Dave Plowman (News)]

But mains frequency isn't always exactly 50 Hz. A high quality turntable could well be more accurate than that strobe.

[Dave Plowman (News)]

TV cameras are very sensitive to the flicker from basic tubes. So they tend to have to be changed less efficient high persistance ones if forced to use this type of lighting on say a location.

One real problem was boxing matches where the ring lighting is designed by the boxing authority, and is fluorescent. The answer was to use a three phase supply with alternate phase feeding adjacent tubes.

[Dave Plowman (News)]

The true reason for the speed adjustment on a TD 125 was not to adjust it to a true 33 1/3 or whatever speed, but to allow adjustment where the speed and therefore pitch of the recording was incorrect. Quite common with older recordings. Which is why is was called a transcription deck.

[John Rumm]

I find head torches very good for some machining operations - very good for keeping the light exactly where you need it and not casting your own shadow on it.

[RJH]

+1 - I've used a Petzl for some 5 years, still going.

[Jethro_uk]

Ah, the lathe did have an incandescent lamp fitted over the chuck ....