Those lights are power hogs. In this day, and age all they are good for is a Lizard aquarium. Go to the store, and spring less than $10 on the highest wattage CFL (compact fluorescent) bulbs you can find in the red spectrum.
Right now you are using 300w/hrs of power, for the same wattage you could be using 15 20w bulbs. Thats enough light to grow at least 3 times the amount you are now.