Unlike EVERYOTHER QotD, this one is immediately open to everyone regarless of experience or educational status. Only this time. Only this once.
In days of old, let's say primarly in the late 1960s, it was rare to find an A/V projector that did not have at least some provision to deal with a blown lamp mid-lecture. The Overhead Projector especially had several options: spare lamp inside the lamphouse, spare lamp beside and sharing optical path with the primary. Upon main failure, the operator swung a lever, which moved the sockets and engaged the spare. Or the fully-automatic--if the projector sensed no light coming from the main, the spare would be automatically energized.
My question is...did any stage light manufactures ever (attempt to) incorporate this feature? If yes, name names. If no, why not?
And your reward for sitting thru and reading all that, a humorous anecdote. About 1986 my friend came in to work the nex day having run an Altnam Comet* for the first time. When asked how it went, she answered, "it was fine, but we blew a lamp." "No worries" says her ME, "Open the lamp door." "So I did that there was a spare lamp, just like a matte knife blade!"
*I'm thinking it may have been a Phoebus Ultra-Quartz rather than a Comet. Used the same 360W ENX or FLE MR16 lamp.
In days of old, let's say primarly in the late 1960s, it was rare to find an A/V projector that did not have at least some provision to deal with a blown lamp mid-lecture. The Overhead Projector especially had several options: spare lamp inside the lamphouse, spare lamp beside and sharing optical path with the primary. Upon main failure, the operator swung a lever, which moved the sockets and engaged the spare. Or the fully-automatic--if the projector sensed no light coming from the main, the spare would be automatically energized.
My question is...did any stage light manufactures ever (attempt to) incorporate this feature? If yes, name names. If no, why not?
And your reward for sitting thru and reading all that, a humorous anecdote. About 1986 my friend came in to work the nex day having run an Altnam Comet* for the first time. When asked how it went, she answered, "it was fine, but we blew a lamp." "No worries" says her ME, "Open the lamp door." "So I did that there was a spare lamp, just like a matte knife blade!"
*I'm thinking it may have been a Phoebus Ultra-Quartz rather than a Comet. Used the same 360W ENX or FLE MR16 lamp.