The Arcadia Marine Deep Blue has been designed to best compliment saltwater habitats and coral reefs because of the subtle blue hue of the light emitted. It uses the blue end of the spectrum to bring out the natural fluorescence of some species and give your tank the deep blue effect. It compliments perfectly white, purple and pink lights helping to really illuminate the beautiful colours of your fish, crabs and corals. The Arcadia Marine Deep Blue is available in 3 different lengths in the newer and more efficient T5 Model. T5 lights offer a better light spectrum meaning your aquarium will be bathed in light closest to those found in natural habitats. They have reduced power consumption but still offer higher luminance than the older T8 model and their compact size means you can more of them to create a beautiful aqua-scape. The T5 has reduced power consumption due to the improved luminance rating, as it operates at a higher temperature (This can provide typical energy savings of 30%) The T5 has a longer lifespan, up to 25% longer+ Reduced mercury levels used in the lamps Sizes Available: 24 Watt - 22\" / 55cm 34\" Watt - 34\" / 85cm 54 Watt - 46\" / 115cm