I have not done IR inside an elevator. However, one fundamental concern / question I would have is whether the IR power would be too strong, since the IR illumination would be reflecting off walls no more than 10 feet away. By contrast, most IR is designed to be used over wider / more open areas.
Let's see who has experience with this.
Only ever done a few elevator camera, none with IR, but I agree with John, most IR would completely wash out anything in such a small space. Options might be a camera with some form of "smart IR" that can dial back the output, or if you're feeling adventurous, manually disabling some of the LEDs, either by covering them up, or by disconnecting them.
Never done it but Matts advice to use something with smart IR would be my recommendation. Try one of the Hik 2 line domes they have that feature and are cheap enough to see if it would work. I have tried smart IR in a small place and it does work, one question does the lift have mirrors?
The biggest concern in using an IR elevator camera is interference of the camera IR light with the elevator door sensors. I would never recommend using IR lights inside an elevator cab. Elevator cabs have constant lighting for most of the time and enough lighting to accomodate even the worst of cameras.
Not sure the liability added by use of an IR camera outweighs the lack of video while a cab is shut off or the elevator light bulb goes out.
I'm impressed with how luminaire-aware you are!
Thanks... I think? Luminaire awareness comes in handy for baiting the anti-CFL crowd... ;)
And although I don't know exactly what elevators you have been on, I would challenge you to look up next time you are on a elevator in a upscale hotel or other semi-posh setting, if you don't see a diffuser, but instead see circular point sources they are most likely halogen/incandescent fixtures.
Actually, now that I think about it, I can think of one elevator that has four small halogen floods (the mini-PAR types) and brushed stainless walls. I remember what a pain those fixtures where when I had to take one of the ceiling tiles out to install the camera...
Other than that though... the vast majority of commericial fixtures still tend to be fluorescent.
I hope ipvm can make an experiment on this.