Hi all,
I was hoping to pick your brains once again.
I’ve been having issues with some of screens looking dim.
So, not knowing if the issue is the bulbs or the projectors I decided to try to find the issue logically.
So first, using a light meter I verified that what was seemingly clear was true – that screens 1 & 4 were brightest. So I decided to use #4 for all the testing. Since it was the brightest, I could rule out the projector as the issue and test the brightness of each bulb from each projector in the same place so I could truly compare bulb to bulb. I have found one issue so far that is preventing me from properly comparing apples to apples.
On this projector #4 if I put a bulb in “Lamp 1” and then get a light reading its one result.
But if I put it in “lamp 2” slot its reading as twice as bright (and looks it too …not a light meter issue)
So my first question is – are lamps 1 and 2 not supposed to be the same light output ? Logically I’d assume they should be the same – but if you look at where the bulb goes into the projector (NEC 900C)
The “aperture” (not right term but from the film ages its seems closest to explain) is not the same. Where the bulb shines into the projector it looks totally different in slot 1 vs slot 2 – and all the projectors are this way. So since the 2 slots are designed differently, I thought perhaps one IS actually brighter by design ?
Anybody have some knowledge on why slot 2 with same bulb shines twice as bright ? And why the two slots aren’t designed the same ?
Any assistance is appreciated. I’m just trying to get everything as good as possible during this downtime.
(below is a pic of where the bulbs go in and how they look different where the bulb shines into projector)
Thanks !!
bulbapp.jpg
I was hoping to pick your brains once again.
I’ve been having issues with some of screens looking dim.
So, not knowing if the issue is the bulbs or the projectors I decided to try to find the issue logically.
So first, using a light meter I verified that what was seemingly clear was true – that screens 1 & 4 were brightest. So I decided to use #4 for all the testing. Since it was the brightest, I could rule out the projector as the issue and test the brightness of each bulb from each projector in the same place so I could truly compare bulb to bulb. I have found one issue so far that is preventing me from properly comparing apples to apples.
On this projector #4 if I put a bulb in “Lamp 1” and then get a light reading its one result.
But if I put it in “lamp 2” slot its reading as twice as bright (and looks it too …not a light meter issue)
So my first question is – are lamps 1 and 2 not supposed to be the same light output ? Logically I’d assume they should be the same – but if you look at where the bulb goes into the projector (NEC 900C)
The “aperture” (not right term but from the film ages its seems closest to explain) is not the same. Where the bulb shines into the projector it looks totally different in slot 1 vs slot 2 – and all the projectors are this way. So since the 2 slots are designed differently, I thought perhaps one IS actually brighter by design ?
Anybody have some knowledge on why slot 2 with same bulb shines twice as bright ? And why the two slots aren’t designed the same ?
Any assistance is appreciated. I’m just trying to get everything as good as possible during this downtime.
(below is a pic of where the bulbs go in and how they look different where the bulb shines into projector)
Thanks !!
bulbapp.jpg
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