Quote -  As a guideline to converting coordinates from Poser to Luxrender I found that dividing the number of meters in Poser by 2.63... gives the coordinate to use in Luxrender.

Example:
a spot in Poser pointing to coordinate (5, 2, 1) translates in Luxrender as "point to" [1.9 0.76 0.38]

This is just an estimate, but it should get you in the right direction.

Probably a "rotation" entry may help (insteed of "point to"). Background: It's impossible to find out where a light in Poser points to (except if a special "target" prop is used).

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