I recall three darkrooms that I used, in 1960 a makeshift one in bathroom in my home, 
a regular one in an armory in Greenbelt MD about the same time, and one in the student union at UT Austin about 1970. All three used red lights IIRC.

On Jul 1, 2022, at 8:26 PM, Greg 'groggy' Lehey <grog@lemis.com> wrote:

On Friday,  1 July 2022 at 17:57:35 -0700, Adam Thornton wrote:
On Jul 1, 2022, at 5:08 PM, Greg 'groggy' Lehey <grog@lemis.com> wrote:
On Friday,  1 July 2022 at 20:12:44 +0200, Harald Arnesen wrote:
Except that we didn't use red light in our darkrooms at all, at least
not from the 1970s and on. ...

Correct.  I started darkroom work in 1964, and from the beginning we
used amber safelights.  I don't think red safelights have been used
since long before that.

When I learned film photography in the mid 1980s the darkroom had
red lights.  Of course it was a very old darkroom in a middle school,
so I'm sure that _adequate_ darkrooms had better equipment.

Hmm.  Any idea how old the equipment is?  I suppose you wouldn't
expect people to replace existing, functional equipment without good
reason.

Greg
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