Giesemann Super Flora 39W 36" T5 HO Lamp 34 inches from end of pin to end of pin (for 36 inch fixtures/retrofits) The Giesemann Super Flora is a high-performance T5 tube developed for optimum plant growth and to accentuate the blue & red colors of your fish. 39W T5 HO Lamp. Will work in any T5 fixture, as long as you are using bulbs of the same wattage and length as those currently in your fixture Recommended for freshwater planted & fish only aquariums Inhibits algae growth by specially designed light spectrum