● Uses a safe 12-volt effort. ● High-brightness LED, energy-saving, durable, and environmentally friendly. ● Can be used for general lighting and in aquariums. ● Has a very strong radiation depth in water and emits light at a low temperature. ● Structure made of solid aluminum alloy, elegant, with adjustable leg distance, easy to use. ● This product is suitable for breeding coral reef cylinders, and cooperates with the lamp in opening it day and night, and can be operated alone to simulate moonlight. More suitable for coral growth in the cylinder. Length: - 4.9 watts 30 cm Length: - 6.5 watts 40 cm