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This topic comprises 5 pages: 1 2 3 4 5
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Topic: Aftermarket LED replacment part #'s Does any one know any??
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Ken Lackner
Phenomenal Film Handler
Posts: 1907
From: Atlanta, GA, USA
Registered: Sep 2001
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posted 11-23-2008 11:35 AM
quote:
It all depends...if people are bitching about the cost of the LEDs ($75.00 list from Dolby), then Tony is right [sleep] The cost/hour is insignificant.
If we are talking about extending LED life by switching them on/off, then Tony would be quite out of line with his [sleep]
Exactly. What we (well, not me) were talking about originally was getting rather ridiculous, but I think this has turned out to be a very informative thread.
quote: Mark Gulbrandsen
I don't get the (and authorization) part.....
I imagine most owners, whether they are individuals or circuits, would not want a projectionist performing tasks that should be left to a technician. It was pretty much a disclaimer from me, in effect saying that unless you know what you are doing AND are authorized to do it by YOUR employer, do not do it.
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Ken Lackner
Phenomenal Film Handler
Posts: 1907
From: Atlanta, GA, USA
Registered: Sep 2001
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posted 11-23-2008 11:36 AM
quote:
It all depends...if people are bitching about the cost of the LEDs ($75.00 list from Dolby), then Tony is right [sleep] The cost/hour is insignificant.
If we are talking about extending LED life by switching them on/off, then Tony would be quite out of line with his [sleep]
Exactly. What we (well, not me) were talking about originally was getting rather ridiculous, but I think this has turned out to be a very informative thread.
quote: Mark Gulbrandsen
I don't get the (and authorization) part.....
I imagine most owners, whether they are individuals or circuits, would not want a projectionist performing tasks that should be left to a technician. It was pretty much a disclaimer from me, in effect saying that unless you know what you are doing AND are authorized to do it by YOUR employer, do not do it.
EDIT: Um. Wow. Don't know how that happened. (Referring to the double post. Does a moderator care to delete one?)
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Tony Bandiera Jr
Film God
Posts: 3067
From: Moreland Idaho
Registered: Apr 2004
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posted 11-24-2008 01:54 AM
quote: Ken Lackner
EDIT: Um. Wow. Don't know how that happened. (Referring to the double post. Does a moderator care to delete one?)
Happens to me on another forum when using IE for some strange reason...
As for the ![[sleep]](graemlins/sleep.gif) I was trying to be somewhat funny, not intending disrespect for the new direction of this thread, although I do believe we've discussed the whole switching the LED thing on another thread a while back. ![[Smile]](smile.gif)
As for switching the LED: In special venues that don't always run film or do run a lot of video, and the LED supply happens to be in the sound rack (and thus powered on when the rack is) sure, I agree that shutting it off when not in use is going to save a good amount of LED life. In fact, the screening rooms I build are set up so that the LED's don't come on until the film mode is selected in the booth.
However, in an average cinema where intermissions may be as little as 1/2 hour, with 5 shows daily that's only 1.5 hours of extra 'on" time if not switched with the motor. If the intermissions are longer of course that time increases.
Again, I still don't see (and in most of the installs I've run into so far) the need to switch the LED to gain that much extra lifetime.
You'd get better overall LED life by making sure when it's installed that the physical alignment is done properly to maximize the intensity and uniformity, then reduce the LED current as much as possible, while tweaking the pre-amp gain up (being careful not to go too far and have added noise.)
And Sam and/or Mark , please correct me if I'm wrong, but wouldn't switching the LED off and on tend to stress it more than just leaving it on?
In any event, it's always good to do what works best for your customers, no matter what differences in opinions are expressed here.
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