Marineland Advanced LED Strip Light, 18-24" Appropriate for fish-only tanks as the main light Built-in digital timer automates 24-hour aquarium lighting sequence 6X 1 Watt 7500K White Daylight LEDs & 3X .6 Watt 460nm Actinic/Blue LEDs Adjustable mounting legs offer flexibility in tank sizes and can expand from 18" to 24" Dimensions: 18" x 5" x 1.5" high