Thank you for your inquiry. That particular tank only allows the type of strip light it currently houses. Here are some options you could try for adding additional light to the system:
Fluorescent strip, Dimensions: 18.25 x 5.25 x 3.25, Item #: 28162, UPC code: 0 4749728162 8
LED light bar, item number 32996, UPC bar code 0 4743132996 2, (This one is approximately 12" long)
Both are sold through retail pet stores, or you can try these online vendors:www.thatfishplace.comwww.petsolutions.comwww.aquariumguys.com
Another option would be to use a glass canopy, and place the 18-24" Double Bright LED light over it. I personally had a 44 gallon pentagon with this setup, and had live plants. They and the fish did very well, and the tank looked great.