Using DC 12V safe voltage.High brightness LED, energy saving, durable, environmental protection.It can be used for general lighting and used in an aquarium. It hasa very strong irradiation depth of water and a low temperature light release.Solid aluminum alloy shell, elegant, feet distance is adjustable, easy to operate.This product is suitable for breeding cylinder coral, cooperation to call lamp in the day and night opening, can open alone simulating the moonlight.More suitable for coral growth in a cylinder.Length :- 4.9 W 30 cm Length :- 6.5 W 40 cm