Simulate the effect of moonlight, auto-sensing light, light, dark (at night from the main light off) automatically open during the day and auto-off.  12 pure blue light-emitting high-brightness LED components to do, life is very long, in the fish tank to create a submarine Youlan effect.  Easy installation, vat you can put on the stretch, the small cylinder and opening up on the cylinder can be hung on the cylinder wall, suitable for 8-15 mm thickness of glass,  The circular light-emitting body can be rotated 360 degrees, adjust any lighting angle,  Use 12V power converter, security, total power consumption is only 2W