The Arcadia T5 Marine Pink has been designed to complement and enhance the beautiful colours and textures of your aquarium. In particular this bulb is best suited for a saltwater habitat and works best with blue and white lights. The pink hue of this bulb helps to fill in the lighting gaps left when using only blue and white lighting. It accentuates in particular the blue and the red hues of your fish, crabs and corals. It also helps to promote growth and health in SPS corals. The Arcadia T5 Marine Deep Blue is available in 3 different lengths in the newer and more efficient T8 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