Square Pin 55W/65W PC Compact Real Actinic Blue Fluorescent Bulb

True Super Actinic Blue 03 420nm. Excellent choice for saltwater and reef aquariums. Promotes photosynthesis essential for the health of coal and invertebrates. Intensifies the beauty and vibrant color in fish, coral and marine life. Best supplemented with 6700k or 10,000k Super Daylight for dawn to dusk control. 1.5 in. W x 21 in. L x 1 in. H. Hamilton Compact Fluorescent lights supply the most concentrated light intensity, color spectrum and wavelength essential for photosynthesis and coral health.