Fluval Ultra Bright LED Strip Lights feature three rows of 7000K LED daylight bulbs, as well as blue LED moonlight bubls. This bulb combination produces the same light intensity as a twin tube fluorescent strip light, but using a fraction of the energy. The light produced replicates natural light and accentuates colors of fish and plants, creates an attractive shimmering effect, and is excellent for fish-only marine tanks or freshwater and low-light planted tanks. Each fixture has a sleek, low profile design and extendable ABS leg supports that expand to fit wider tanks. These legs can be completely removed so the fixture can be placed directly on a glass canopy for an even lower profile if desired. A single 3-way switch allows you to turn all LEDs on for daylight, only the blue LEDs for a lunar effect, or all off. The LEDs are designed to last up to 20,000 hours, providing over 5 years of lighting under normal operation.