At one time every power on indicator on electronic equipment was neon and usually red. These days with consumer electronics the favoured colour seems to be blue and implemented with an eye burning laser!
Yes, I have a KVM right here that is like that. Thin layer of Blu-Tak dims it nicely.
Did they have gas lights too. ?
The one I saw in the new section at whipps cross didn't have any switches.
Blue LEDs are more "modern" as they weren't available (at least affordably) a decade or so ago. (Nobel prize winning too.)
Some have green for on and red for standby, often in the same component.
One of those bi-sexual LEDs or is gender neutral the proper term ;-) You can get rainbow ones too. :-)
My project started about 2002, I was the custodian of project standards for a while and I don't recall having one for instrumentation displays. But the mandatory HF overview was a relatively new thing at the time. It was a fairly novel and complex project, the first level was the physical engineering, the second was the electrical and mechanical interlocks to trap and recover from various faults, and it was only as this became firmed up that it was possible to start thinking about displays. The first design would have come from the hardware guys to help the people preparing the documentation and safety cases, knowing that it would have to pass a formal HF review. Believe me, it was a lot more user friendly than the original 1950's hardware that it replaced. IIRC one of the old procedures required the operator to count 43 turns of a hand-wheel.
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