For the w2 the requirement is 12vdc or 24vac, 12W.
You can use any power supply, 12 or 24 VDC or 24 VAC. The Vario power supply isn't really doing anything out of the ordinary.
The question on lighting up the driveway I can't answer. I'll send this on to Raytec for comment.
Yes, the Vario w2 can be used to light up the driveway. White-light is visible so crosses over into general lighting applications.
The question is how much will it light up the driveway?
If you can let me know the dimensions of the drive (and confirm you are using the 10 degree beam) together with the mounting position of the light I can run a quick lighting design for you.
We ran the calcs through our lighting design programme. The position is slightly wrong (we presumed central) but it gives a good idea. Designs ran with 10 degree, 60 degree, 80degree and 120 degree. We would advise the 80 degree lens for the best overall coverage of the drive. The narrower angles are too "narrow" and the 120 gives a better spread but loses power.
I'll check if there is a way I can upload the file here.
So, still looks like the 80 will be the best fit? Does it come with the 89?
yes, the 80 degree looks best if you want to illuminate a better spread of the area. Each VARIO is supplied as a package to deliver 10, 35 and 60 degree options out of the box. The 80 degree version would need an additional lens - the VAR-w2-LENS-8030. It is a low cost additional part.