The Lumia+ features an asymmetrical design that ensures it always sits correctly in the hand, unlike round lamps. This unique design allows the switch to be easily located without having to look at the lamp. The cap and housing are coated with thermoplastic rubber for a comfortable, secure, and quiet grip. These features provide a significant advantage over round aluminum lamps, where users often struggle to find the switch and may even need to use both hands to turn the lamp on. The switch has three positions: off, momentary with automatic reset, and on. The momentary position is very useful for brief lighting or signaling. The elastic band with a Tanka allows for easy adjustment to the user's needs. The electronics ensure consistent brightness, even when the batteries are not fully charged. The LED's color temperature is in the neutral white range to ensure maximum color reproduction of the underwater world. The LED light beam is focused into a spot of approximately 8° by a lens made of highly transparent material, protected by an optical polycarbonate cover, with a medium light circle. Batteries are included. The Lumia has two brightness levels, adjustable via a slider on the circuit board.