I got a vector V2 at walmart and on the side of the box it said the output on it was 1365 lumens. It uses a 75 watt bulb, so that means this spotlight is doing about 18 lumens per watt. If you use that same efficiency rating for the thor it would look like this. (I'm not sure but I think the thor has a 130 watt bulb)
18 x 130 = 2340 lumens (roughly)
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I think this link would help you. Chech out the graph at the top of the page.
http://www.mme.state.va.us/de/hbchap8.html
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The big thing about spotlights is the throw not the overall out put. But I'm just like everybody else and I was curious as to how many raw lumens my spotlight was doing.
Hope this helps
Scott