Im adding lighting to my 2D Tile based game.

I found the link http://blog.josack.com/2011/07/xna-2d-dynamic-lighting.html useful, but the way its done it dosent support collision. What Id like is some help or links as I want one that can have

-always lit up light points -collision (If the light ray hits a block, then dim the next block by whatever amount until its dark)

Im a noob at this stuff, but ive been searching around for quite a while but no luck (I did find Catalin's tutorial, but it seemed abit advanced for me)