Some quick screenshots.
These are both using 940nm lights, 850nm would be brighter (updated to include an 850nm shot for comparison).
Driveway.
This is the install. It's about 8ft off the ground. Camera is a Hikvision 3mp, 4mm (I'm considering putting a Huisun PTZ bullet here...). Light is 15°. Eveything is very exposed to the weather, and has been fine so far.
This is how it looks with the illuminator turned off. All of the near lighting is from the camera above, and another one to the bottom right of the picture which points across to the bottom left (back gate). Distance to end of driveway is about 40 metres (130 ft). This isn't a really effective comparison I'm afraid because there's quite a lot of light down the other end of the driveway already from cameras and illuminators at the front of the house. Without them it would be pitch black down the end.
With the light on:
Where you really see the value of having the extra light is when there's an object in the driveway, so this doesn't do it justice. Without the extra light everything remains black until it gets half way up the drive, with the light I can see someone/something as it enters the drive. This is also why I have the light angled down quite far rather than pointing higher, more out into the street.
EDIT: Added shot using an identical illuminator to the one above, only this one's 850nm wavelength rather than 940nm. So much brighter (or at least, this particular camera works much better with 840nm, I believe this differs somewhat from one cam to another), but the red glow is really obvious if you're within the narrow angle of the illuminator's throw - well worth going for the 840nm if you're not fussed about everyone knowing it's there:
Back of the house. The camera is a Hikvision turret, 3mp, 2.8mm. The porch light on the right hand side in both pics stays on overnight. Illuminator is 120°, 940nm. Distance to house is about 12m (40ft).
Light off:
Light on:
Looking at this now makes me think I could probably afford to adjust it a bit to the left. It's mounted only about 3 feet high, which is far from ideal, but works really well with motion detection all the same. It's the only source of IR light, the cameras' emitters are all turned off.