GIESEMANN actinic blue emits almost exclusively blue light of wavelengths from 400 - 510 nm, with a maximum at 420 nm. These wavelengths enhance the growth of many coral species in the aquarium, thus ensuring optimum lighting conditions. Since most aquarium inhabitants live in seawater depths where the light is very blue, it is needed to simulate this natural living conditions in the aquarium. The GIESEMANN T-5 / actinic-blue has therefore been developed to enhance the blue proportion in marine aquariums. GIESEMANN T-5 / actinic-blue emits almost exclusively blue light of wavelengths from 400 - 510 nm, with a maximum at 420 nm. These wavelengths enhance the growth of many coral species in the aquarium, thus ensuring optimum lighting conditions. GIESEMANN T-5 /actinic-blue reinforces the natural fluorescence of corals and brings them excellent to bear - especially in the twilight phase when being used alone. The optimal use of the GIESEMANN actinic blue is the combined with either the GIESEMANN T-5 / super-actinic or super-purple or combined with our MEGACHROME HQI bulbs. GIESEMANN T-5 /actinic blue should never been missed for the lighting of coral reefs in any aquarium. Many scientific research institutes and public aquariums rely on GIESEMANN lamps. This is an impressive proof of the outstanding quality of our products. GIESEMANN T-5 / actinic blue are available at all power levels 8, 24, 39, 54 and 80 watts. Recommended for Marine/Reef Aquaria Increases the fluorescence effect of coral and shells Very long color stability through quality phosphors actinic light spectrum Promotes coral growth Beautiful light in the twilight phase Amazing effects of all sea creatures Made in Germany