Used 2 x 23W CFL 6500K lamps, Dual Opposing socket, Aluminium Dryer Tube, and small computer fan on existing strip light fixture. Duct tape and 2 hours time.
Removed single 18" T8 tube fixture from light hood. Fashioned reflector from Dryer tube. Built bracket for dual socket from dryer tube scraps. Cut vent holes in reflector to mirror holes in light hood. Cut hole in light hood on back just left of center to accommodate fan and leverage existing hood power cord. Mounted computer fan with airflow going into the hood to take advantage of convection.
So I went from a single 14W tube to 2 x 23 watts CFL (46 total watts) at 6500K. 3 x's more light! (-;
Total cost $17.26 in parts. Had computer fan and adapter already. Fan scavenged from old PC.
So this is admittedly a little kludgy, what with 2 power cords (one for lamps and one for 12v fan supply). It works tho and lamps are adequately cooled. The lamps rest on the glass from my tank cover, but I'm guessing that will heat sink them a little.
We will see how my plants get along now. The fish seem happier.