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Hi, Ariel
 I apologize for spaming the forum once again:) But this kind of issue is really tough for me:(
Hope you can help me!
Here is what I want, I just wanna do a lamp, of cause it has its own light which will not only effect the lamp itself, but also effect the objecst around it. The point is how to get fully control over the light parameters, such as the distance, the direction, the target, etc. Because I want to do something like this.
Well, I watched all the examples in the pre-release pack, however, there might be too few of  light examples related to this issue.   
Any ideas to do this?