
Originally Posted by
chesirecat
A projector bulb lasts about 3,000 hours, from looking around the web a bit, without under-driving it, and I am guessing the bulbs cost about $500.
So, I figure that with ten hours of operation per day, a single projector bulb would last about ten months. There are other factors involved, such as cooling of the bulb. But if the under-drive the projector bulbs by about 20%, you've got a 50% increase in lifespan, so if they did that then theoretically you've got a 6,000 hour bulb, which would last more than a year.
Let's say they have 20 projectors bulbs in use, then one or two bulb would blow out every month. That would cost about a thousand dollars a month.
I think the real issue is that maintenance has to check the projectors to make sure they are working, though if they could get projectors that switch to a back-up bulb, then they could check the projectors at a pre-specified time each month.
Assuming the have the space, replace these projectors with the new ones that use an LED/laser source. I am 99% sure that they are running the sub projectors in "economy" mode, or in other words, under-driving them as some scene definitely look dimmer. With an LED/laser light source, you can have brightness and a long life.
If given a budget, I bet I could even rig a system with fiber-optics to provide the light for the projectors from an easily serviceable location, and perhaps using a couple of LED light sources to power the older models of projectors they have (different spectrum when compared to incandescents, but I would play around with primary colors and try to find something, you could under-drive an "array" of project bulbs such that they would last years and years, and calibrate so that you have the approximate intensity). That way you could monitor the quality/intensity of the light source. I would 100% do it, even if it voids the warranty on a projector!
I do have experience with this stuff, I built an exact replica of the Disneyland "twinkle lights" in my front yard by significantly under-driving 14-V 258 flashers in custom hand-made E-10 weather proof sockets I designed, which are even smaller (less noticeable) than the ones in the hub, the exact same type of bulb used in the classic flasher lights in the hub, storybook land canal boats, and even in Small World on the blinky flowers. My 258 flashers have a lifespan of something like 300 hours at 14 V, but I bet they last something like +10,000 at half voltage or less. If possible, they could precisely under-drive brighter bulbs than what the projectors require so that they last for years. It just takes some tinkering to get it right. Manufacturers *design* incandescents to fail at a certain lifespan, usually around 3,000, but if you under-drive them they last many, many times longer, its all about making money for the bulb company.
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