Fluval Power Spectrum T5 HO Fluorescent Bulb - 39 W High intensity, high temperature light Ideal for freshwater, saltwater and planted aquariums, coral and invertebrates Longer life versus other comparable high output fluorescents & Ideal for marine and African cichlid aquariums Super bright lighting, strong blue spectral range, stimulates photosynthetic corals, invertebrates and other marine life Dimension:Length : 85 cm (34 in) x Diameter : 16 mm (5/8 in)