Cordless tank illuminating device offers high performance in a powerful, miniaturized, detachable light port. In sharp contrast to other larger tank lights requiring extension cords, wiring and electrical outlets, the tank illuminating device is conveniently detachable and portable. A powerful 70 lumens is produced using two 3V readily available lithium batteries with a specially designed XENON lamp. Body design is T316L stainless making it corrosion and moisture resistant. Light is attached with a MetaClamp connection for sizes 1” and larger.