Hi @tropisch,
warning: Long post 
I guess, you’ll get more support here when using Raspbian Linux or openHABian on the Pi. So I would recommend one of these.
And … sound like you try to avoid Linux/Rasbian/… since your are more familiar with Windows probably? Sorry if I’m wrong here
But if so, you can start with something without touching Linux command line at all - at least for the first steps. Maybe, it’s worth trying:
Dresden Electronic offers a customized Rasbian image fully preconfigured with their DeCONZ software:
Just write it to a 8GB sd card, put it in your Rpi and power it on. You don’t even need to connect a keyboard nor monitor. Just power it on and hook it to your network. You’ll we able to connect to it via any web browser. Just follow the instructions in:
https://www.dresden-elektronik.de/fileadmin/Downloads/Produkte/9-FLS/WirelessLightControl-QSG-dt.pdf
Few post above I wrote:
Well, that’s not true anymore. Meanwhile I gave it a try.
I was curious to see if it works. And yes it does!
Here are some screenshots, how to connect to Raspbee via Deconz til the native support by @chris’s Zigbee binding is merged.
So let’s start:
(assuming, you have installed Raspbee/Deconz as written above and have a openHAB instance running somewhere else)
Attach some light(s) to the Deconz. Check, if you can control your lights from within this web app:
Install the HUE binding via the PaperUI and go to the inbox → “+” → HUE Binding → add manually:
Select a “HUE Bridge” to be added. (a genuine HUE bridge will be discovered automatically, but the Deconz-HUE must be configured manually).
Before proceeding, go back to your Deconz window and click in the Gateway → Advanced configuration → Authenticate app. This does the same as pressing the connect button a real HUE bridge:
Back to the PaperUI - Now put the Ip address of your Deconz gateway in and click on blue o.k. button:
Your gateway should now getting connected and the attached lights will be discovered immediately:
Click on the blue o.k. button(s) to finally add the lights to your list of things. You’re done!
If all went right, you’ll be able to control your lights from openHAB:
I have to admit, I won’t recommend this to somebody who is asking which stuff to buy. This does more or less the same as a genuine HUE bridge or probably any other Zigbee bridge which can be controlled from openHAB (Osram Lightify, IKEA tradfri). Building an own bridge similar to it is likely waste of money.
But if one already has a Rpi and a Rasbee/Conbee this can be an option to make use of it until the native support of the Raspbee is there
Ah yes, forgot to mention: There is a normal Raspbian-Linux on your gateway. So you can start tinkering with it if you like, install additional software, check out the cli etc. to get more familiar with Linux (if required as I said at the very top)