>>
When selecting IR LEDs, pay attention to the divergence (beam
angle).  Get something that will match your lens's viewing
angle.  One configuration I have used is a "halo" of LEDs
arranged in a ring around the lens of the camera.  Edmund
Scientific and a few others also sell some LARGE infrared
sources that might be appropriate.
<<

Why not use an ordinary LEB (light emitting bulb).  These things are
actually quite efficient and reliable at above-visible wavelengths.  Start
with an ordinary bulb and lower the voltage just below where you can't see
the filament lit anymore.


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