No seriously that article should cover everything you need to do. Just because the title of the tutorial says multiple shadow lights doesn't mean you need to use them all. The techniques applied to one are still relevant.
[quote:9cgbch3p]Let's start with one opaque black layer, which gives us complete darkness. Then we add the "mask". This is a white circle with the alpha fading to transparent around the edges.
Put your object/copy on a layer above to have it show original color.
[quote:9cgbch3p]Other layers on top cannot have this lighting applied, since by the time they are rendered the background already has the light map applied. It's sort of "baked in" to the image by then, and you can only multiply with the final result, which isn't very useful. Arguably however it is useful that now you can put new content on top without it being affected by lighting, e.g. the HUD.