It may get lost between the images so it bears repeating what he stated: "....I have only found these from an EBay seller in NY. He has both 940nm and 850nm, so make sure you get the 850nm, if you get them.
A little more expensive, but maybe more versatile. If you could or have constant 120Vac at the lamp socket (line + neutral), you may install a separate ir illuminator (with built-in light sensor) near the lamp, and you still use the lamp switch
I realize that, It's my misreading. @sebastiantombs mentions 3 watts, and that's what stuck in my head. 3 Watts won't do much, me thinks, but then I re-read it just now, and the bulb is 3x3Watts, IE 9watts total. As always, YMMV.