Perfect replacement bulb for most 7 Watt systems, includes Tetra, Coralife, Cyprio. This is a 2 pin bulb that is 61/4'' long. Ultraviolet light is invisible to the human eye. Never look at the bulb when lit. Ultraviolet light is invisible to the human eye. It is part of the electromagnetic spectrum that lies beyond the purple range of the visible spectrum. The ultraviolet (or UV) spectrum has wavelengths between 100 and 400 nanometers (nm).
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1 month ago
2 weeks ago
