No, it doesn't.
Wrathlamps light a semi-spherical area around the wrathlamp with a radius of about 15 or so
Greg's Lighting spotlights light in a straight line extending from the spotlight for a distance of about 60 blocks. (Note that all three spotlights have the same distance, so the two powered versions are all but pointless if the unpowered one is configured on)
Both mods use similar mechanics to get this extended light: Invisible, walk through blocks that emit light level 15. Greg's interferes with plants less, because it's just a single line of blocks they can't grow into, but both mods will interfere with xycraft tanks forming and other examples.
Note, however, that Greg's Lighting hasn't updated for 1.5.1/1.5.2