Agree for the most part above but a GLA is a better option than GLC in my opinion as prime modern lamps. Reason is as with the past, the audience will find bright enough with the lumen level on stage is presented a 1,500 to 2,000 hr lamp. Bang for the buck and getting lamp changed, the longer life lamp is better in not changing as much, and might get a tax credit. One should stock the GLC for specials etc. in getting that extra punch in short of going 750w, but an overall sense of toning down wattage and having a very high head room for going "11".
Thanks for your above info on shelf life!!! Very important to keep in mind as a base for info.
As for GLA/GLC, I go to the concept of it's about the luminous output of the stage for the fixtures. If over the past say 100 years, art was made with what ever lumens were put on stage with electric lamps, once the house lights go down and the stage lights gently come up to a scene.... the eye balls will adjust to what lumen levels are provided after the blackout. Eyes are getting adjusted to lower luminous levels and you now have a lot of head room in providing specials or scenes, but long life as a goal for the norm.
Shelf life of a lamp is typically based around the condition of the potting cement. Once the potting cement crumbles and dries out (8-15 years depending on humidity, environment of the storage area?), then the lamp capsule isn't supported well in the base and shouldn't be used. But the inside burner/capsule components typically don't go bad over time from lack of use, so really it's just the potting cement that "goes bad" in my experience.
@DELO72 To maximize shelf life, is it better to store lamps in the dark or in sunlight? Is the loss of lumens and lux increased when darkness prevails and sucks the light out or is it better to bombard idle lamps with sunlight? Is this anything to do with some manufacturers shipping lamps in white Vs. colored packages??Err.. I just realized what a terrible sales person I am! What I MEANT to say is that lamps...err..absolutely "go bad" after... umm... let's say a year, and you should definitely throw out all "old" lamps and buy new ones that are fresher! As John Lovitz used to say, "Err.. yeah-- that's the ticket!"
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