I'd worry about the heat, and about the bulbs failing from being on continuously.
The "cold" part of Cold Cathode has nothing to do with how much heat these units give off, it has to do with their operation method(how they excite the electrons).
Edit: These bulbs last a long time in scanners because they're designed to be used the way a scanner will use them. I imagine the biggest problem you'll have is the heat, just because of how many you want to use. Without seeing someone using them in your specific application, you can't really determine how long they will or won't last for you. As a simple comparison; Sometimes two cars that are otherwise identical go to the junkyard with far different mileages, simply because they were used very differently. Different use, different death.
The "cold" part of Cold Cathode has nothing to do with how much heat these units give off, it has to do with their operation method(how they excite the electrons).
Edit: These bulbs last a long time in scanners because they're designed to be used the way a scanner will use them. I imagine the biggest problem you'll have is the heat, just because of how many you want to use. Without seeing someone using them in your specific application, you can't really determine how long they will or won't last for you. As a simple comparison; Sometimes two cars that are otherwise identical go to the junkyard with far different mileages, simply because they were used very differently. Different use, different death.
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