well im not 100% on the dimensions of the eclipse but the nova extreme 2x18 watt is good, i think its 18inches long but you can adjust the legs. or the 12 inch version with a moonlight. Or the coralife 12 inch version is more wattage. I just really hated the coralife and honestly if he got the 18 inch one for 50$ the over hang is almost worth it just because of the better color. My tank looked like 100x better in just a few hours of switching away from the coralife 9"
I mean if i set up a small tank just for fun that was a few gallons yeah id use the 9" just because i already have it but i wouldnt be that happy with the tank and wouldnt do more than cheap zoanthids and other frags from larger colonies just because of the lose of color id get.
But who knows maybe on a shallower tank it wouldnt be that bad.