Giesemann Powerchrome T5 HO Flourescent Lamps.
What are the benefits of T5 Lighting?A critical parameter of good coral growth and survival, especially hard corals, is light. With the advent of T5's (which describes the small diameter of the tube-5/8"-and does not indicate the lumen out-put), and correct phosphor blends, it is possible to produce a fluorescent tube which can emit 10% more light than the equivalent wattage from a metal halide bulb. This is achieved with a 40% reduction in running cost and without the radiant heat problems associated with metal halide ligthting. The tubes are significantly less expensive than metal halide bulbs with increased longevity-up to 15,000 hours.